CFC Toxicology & Drug Analysis 3

Question 1

Which specimen is most useful for determining drug exposure over a period of approximately 90 days?

Accepted Answer

Hair

Answer

Hair grows approximately 1 cm per month, and a 3 cm segment reflects roughly 90 days of drug exposure through incorporation during keratinization.

Question 2

In forensic cases involving suspected opioid overdose, which endogenous substance must be distinguished from exogenous morphine in hair testing?

Accepted Answer

Heroin (diacetylmorphine)

Answer

The presence of 6-monoacetylmorphine (6-MAM), a unique heroin metabolite, distinguishes heroin use from endogenous morphine or poppy seed ingestion.

Question 3

The Widmark formula is used in forensic toxicology primarily to:

Accepted Answer

Estimate blood alcohol concentration from ingested ethanol

Answer

The Widmark formula estimates BAC based on amount of alcohol consumed, body weight, and gender-based distribution factor (r).

Question 4

Which synthetic opioid has an analgesic potency approximately 100 times that of morphine and is frequently encountered in forensic drug casework?

Accepted Answer

Fentanyl

Answer

Fentanyl is approximately 100 times more potent than morphine and is a leading cause of opioid overdose deaths in forensic casework.

Question 5

A urine specimen submitted for drug testing has a creatinine of 2 mg/dL and specific gravity of 1.001. The appropriate forensic interpretation is:

Accepted Answer

The specimen is substituted or severely diluted

Answer

Creatinine below 2 mg/dL and specific gravity of 1.001 or less meet federal criteria for a substituted specimen, indicating it is not consistent with normal human urine.

(CFC) Certified Forensic Consultant Practice Test

(CFC) Certified Forensic Consultant Practice Test

CFC Toxicology & Drug Analysis 3