Used sometimes by police, forensics after administering amobarbital.
From the en.wikipedia.org
More examples
A barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant
Amobarbital (formerly known as amylobarbitone) is a drug that is a barbiturate derivative. It has sedative-hypnotic and analgesic properties. It is a white crystalline powder with no odor and a slightly bitter taste. It was first synthesized in Germany in 1923. ...
A moderately long-acting barbiturate used both to sedate and to control convulsions.