After a screening test has been used to determine the identity of an abused drug, the confirmation test of choice is the thin-layer chromatography.

The answer is False, The technique mostly use widely by forensic toxicologists for detecting alcohol in blood is the gas chromatograph. Always use of a drug, a person may become less responsive to a drug’s effects and may be able to tolerate blood drug concentrations that would normally be fatal to the casual drug user.

If this question is a true or false question then the answer in this question is false. It is not a thin-layer chromatography that include in the confirmation test of choice after a scrrening test has been used to determine the identity of an abused drug. So the answer is False.