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Forensic Toxicology-Ethyl Alcohol PowerPoint Presentation

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Description : Check out this medical PowerPoint presentation titled "FORENSIC TOXICOLOGY - ETHYL ALCOHOL". This medical PowerPoint presentation talks about Ethyl alcohol is a central nervous system depressant that can impair judgment, coordination, and motor skills. It is also a psychoactive substance that can cause changes in mood and behavior. In forensic toxicology, the presence and concentration of ethyl alcohol in biological specimens can be used to determine if a person was under the influence of alcohol at the time of an incident.

Tags : FORENSIC TOXICOLOGY, ETHYL ALCOHOL, central nervous system depressant, psychoactive substance

Published on : Mar 15, 2023 | Views : 1542 | Downloads : 4

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FORENSIC TOXICOLOGY ETHYL ALCOHOL
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TOXICOLOGY The study of poisons
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TOXICOLOGISTS Detect and identify drugs and poisons in body fluids, tissues, and organs
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ENVIRONMENTALTOXICOLOGISTS
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OCCUPATIONALTOXICOLOGISTS
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FORENSIC TOXICOLOGISTS-duties limited to legal issues Workplace drug testing - Postmortem drug testing Investigation of contraband materials
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TOXICOLOGY OF ALCOHOL A CENTRAL NERVOUS SYSTEM DEPRESSANT
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90 MILLION AMERICANS DRINK.. 10 MILLION HAVE A “DRINKING PROBLEM”
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EFFECTS OF ETHYL ALCOHOLON THE HUMAN BODY PRINCIPAL EFFECT IS ON THE
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FOREBRAIN IS AFFECTED FIRST reasoning, planning, parts of speech, movement, emotions, and problem solving
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REAR PORTIONS ARE AFFECTED NEXT movement, orientation, recognition, perception of stimuli perception and recognition of auditory stimuli, memory, and speech
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… FINALLY THE MEDULLA IS AFFECTED
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LOWERS INHIBITIONS In one study of unplanned pregnancies in 14-21 year olds, 1/3 of the girls who had gotten pregnant had been drinking when they had sex; 91% of them reported that the sex was unplanned. Half of all newly-reported AIDS cases are for young people ages 14-21…
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IMPAIRS JUDGEMENT 40% OF TRAFFIC FATALITIES INVOLVE ALCOHOL
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LONG-TERM EFFECTS HEALTHY LIVER CIRRHOTIC LIVER JAUNDICED KIDNEYS
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ABSORPTION INTO THE BLOODSTREAM 20% OF ALCOHOL IS ABSORBED INTO THE BLOODSTREAM ACROSS THE WALLS OF THE STOMACH 80% IS ABSORBED ACROSS THE WALLS OF THE SMALL INTESTINE
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FACTORS THAT AFFECTHOW FASTALCOHOLIS ABSORBED INTO THE BLOODSTREAM
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TIME TAKEN TO CONSUME THE DRINK
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ALCOHOL CONTENT OF THE DRINK
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TYPE OF ALCOHOL ABSORBED SLOWLY ABSORBED FASTER
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AMOUNT OF ALCOHOL CONSUMED
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AMOUNT AND TYPE OF FOOD IN
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WEIGHT OF DRINKER
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SEX OF DRINKER
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ALCOHOL DISTRIBUTESONLY TO WATERY AREAS
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ONE DRINK IS EQUAL TO.. ONE
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Maximum blood-alcohol concentrations in the blood may not be reached until after time of consumption TO 90 MIN IS AVERAGE
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Under NORMAL SOCIAL DRINKING conditions It takes anywhere from 30 – 90 minutes from the time of the final drink until absorption is complete
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Since alcohol is distributed through the watery portions of the body Other organs may be tested for alcohol
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ELIMINATION OF “BURN-OFF” RATE 0.015% - 0.020% w/v per hour (0.015% is .015 g alcohol per 100 ml blood) 1 – 1½ DRINKS PER HOUR
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OXIDATION AROUND 95% OF ALCOHOL THAT ENTERS THE BODY IS OXIDIZED IN THE LIVER Alcohol → acetaldehyde → acetic acid→ CO2 + H2O
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EXCRETION Is the elimination of alcohol in UNCHANGED STATE 5%
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Blood Alcohol Content
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Measuring Breath for BAC Amount of Alcohol EXHALED is DIRECTLY PROPORTIONAL to the Concentration of alcohol in the BLOOD
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Two ways to measure alcoholin the body: INDIRECT METHOD DIRECT METHOD:
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ANATOMY ARTERIES VEINS CARRY BLOOD AWAY FROM THE HEART CARRY BLOOD TO THE HEART
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Alcohol travels through the body: 20% of alcohol is Absorbed from walls of stomach To veins
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80% passes from walls of small intestine to Veins to liver (Small intestine)
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In ALVEOLI oxygen enters the blood and CO2 leaves it
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At 340 C The ratio of alcohol in the blood To alcohol in the alveoli is 2100:1
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1 ml of blood contains the Same amount of alcohol as 2100 ml alveolar breath
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DURING ABSORPTION: CONCENTRATION OF ALCOHOL IN ARTERIAL BLOOD WILL BE CONSIDERABLY HIGHER THAN VENOUS BLOOD (dark red color) During elimination, venous blood has higher BAC
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THE BREATHALYZER Measures ALCOHOL CONTENT of ALVEOLAR BREATH
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THE BREATHALYZER INDIRECTLY MEASURES THE AMOUNT OF ALCOHOL CONSUMED BY MEASURING THE ABSORPTION OF LIGHT USING A SPECTROPHOTOMETER
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HOW IT WORKS: 16 H+(aq) + Cr2O72-(aq) + 3 C2H5OH(l) → (orange) (alcohol) 4 Cr3+(aq) + 3 CH3COOH(aq) + 11 H2O(l) (green) UNUSED ORANGE MIXES WITH GREEN PRODUCED TO MAKE A BLUE SOLUTION
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In other words…. ORANGE + ALCOHOL → GREEN (Cr2O72-(aq)) Little or no alcohol: ORANGE Some alcohol: BLUE (orange + green ) A lot of alcohol: GREEN or GREENISH BLUE The HIGHER the concentration of alcohol, the LOWER the concentration of potassium dichromate (K2Cr2O7)
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FIELD SOBRIETY TESTS are performed to find the degree of impairment and whether an evidential test is justified
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ALCOHOL GAZE NYSTAGMUS ALCOHOL GAZE NYSTAGMUS (HORIZONTAL OR VERTICAL) INVOLUNTARY JERKING OF THE EYE AS EYE MOVES FROM LOOKING STRAIGHT TO LOOKING UP & DOWN OR LOOKING TO THE SIDE
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WALK & TURN TEST DIVIDED - ATTENTION TASKS
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ONE-LEG BALANCE
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ANALYSIS OF BLOOD FOR ALCOHOL
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GAS CHROMATOGRAPHY USED IN FORENSIC LABS
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IN HOSPITALS.. A CHEMICAL REACTION IS CARRIED OUT IN THE LAB
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COLLECTIONANDPRESERVATIONOFBLOOD
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NON-ALCOHOLIC DISINFECTANTS ANTICOAGULANTS PRESERVATIVES REFRIGERATION SEALED AIR-TIGHT CONTAINERS
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ALCOHOL AND THE LAW
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BLOOD TOXICATION LEVELS OVER 21:
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UNDER 21 .02 or higher
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INCREASED DRIVING RISK
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REFUSE TO TAKE A TESTFOR ALCOHOL INTOXICATION AUTOMATIC LOSS OF LICENSE FOR ONE YEAR AN ADDITIONAL LOSS OF LICENSE FOR ONE YEAR IF CONVICTED IMPLIED CONSENT LAW
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PA DUI LAWS Three tiered system: Fines, jail time depend on the amount of alcohol in the body (BAC) and if there have been any previous convictions .08 0.1-0.159 0.16 and up
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ARD (Accelerated Rehabilitative Disposition The ARD program consists of the following: up to 12-month license suspension community service restitution 6-month court supervision attendance at Alcohol Highway Safety School and its costs CRN evaluation court and administrative costs treatment and other conditions that a judge may impose Persons with any prior convictions are not eligible for ARD
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HOMICIDE BY VEHICLE WHILE DRIVING UNDER THE INFLUENCE Section 3735 of the Pennsylvania Vehicle Code Any person who unintentionally causes the death of another person as the result of… driving under the influence of alcohol or controlled substance and who is convicted of violating [the law regarding driving under the influence] is guilty of a felony of the second degree when the violation is the cause of death. The penalty is a mandatory sentence of 3-10 years incarceration and consecutive 3-10 year terms for each victim whose death is a result. The fine may be as high as $25,000 per victim.
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25% of teen drivers killed in 2003 had a blood alcohol concentration of .08 or greater. A BAC of .08 is the level which all states define drunk driving.
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More than 1,700 college students in the U.S. are killed each year—about 4.65 a day— as a result of alcohol- related injuries.
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Alcohol poisoning most often occurs as a result of the rapid intake of alcohol, also known as binge drinking. This high amount of alcohol can lead to seizures, choking, an irregular heart beat and even death.
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Signs of Alcohol Poisoning Confusion Slow reflexes Unable to communicate effectively Slurring in speech Rapid pulse Feeling sick, vomiting Dehydration Unconsciousness Moist, clammy skin Inability to walk Pale, blue colored skin
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What are the Effects of Alcohol Poisoning? The effects of alcohol poisoning can be devastating, especially if the drinker becomes unconscious. In fact, numerous deaths have occurred as a result of an unconscious person choking on their own vomit or breathing in vomit. Possible effects of alcohol poisoning include: Irregular heart beat Choking (from vomiting) Coma Decrease in body temperature (hypothermia) Brain damage Seizure Strange breathing patterns Inhalation of vomit causing a halt in breathing patterns (asphyxiation) Death
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5 Steps to Take if Someone You Know Has Alcohol Poisoning Call 911 or a local poison control center if you think someone you know has alcohol poisoning. Stay with the person. Never leave a severely intoxicated person alone. Turn the person onto their side to prevent choking if vomiting occurs. Monitor breathing levels. If you know CPR, be prepared to use this skill in case of an emergency. Continually try to revive the person if they are passed out.
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EXPUNGEMENT is a legal process through which an arrest or conviction may be erased from a person's criminal record.
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In Pennsylvania: Juvenile DUIs
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PERSONAL AND PROFESSIONAL CONSEQUENCES
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75 % OF EVIDENCE NOW BEING EVALUATED IN U.S. CRIME LABS IS DRUG-RELATED 90% of drugs tested in a toxicology lab