Crossword puzzle clue "drug tester's control substance"

Here are the possible solutions for drug tester's control substance clue

Answer
Clue
Relevancy
placebo
Clue
Drug tester's control substance
Medical test control substance
Control substance?
Definition
(Latin) a medicine given to humour a patient
czar
Clue
Drug ___ (federal drug-control boss)
Drug ___ (federal drug policy overseer)
Drug ___ (federal spokesperson on drug policy)
Drug ___ (federal drug policy spokesperson)
Definition
(Russian) an emperor or king, also TSAR, TZAR, KSAR
lsd
Clue
Drug used in old CIA mind-control experiments

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