Yes, if you have expensive and sophisticated equipment, such as a mass spectrometer.
placebo
Scientists use a placebo to check that the variable they are changing actually is responsible for the results they see. It is like a control experiment, allowing you to compare the trial with it to see if there is any effect. It also counteracts the "placebo effect". For example, this is when someone taking a drug calims they "feel better" despite the drug not actually having any effect. Therefore, by giving some test subjects a placebo and some the drug being tested and not telling them which is which, you can eliminate the placebo effect from the test.
Placebo are used for a correct testing or drugs, not for avoid harm.
Conditioning can be applied to practical problems by shaping behavior through reinforcement and punishment. By reinforcing desired behaviors and extinguishing undesired behaviors, individuals can learn new skills and habits. This approach can be used in a variety of settings such as education, therapy, and personal development to modify behaviors effectively.
The Placebo Effect
to see if they smoke illegal things
placebo
the Treatment Assessment Screening center has different panels in which the test drugs for. it depends on which panel you have, you can see all the the different panels and which drugs they test for in each panel here http://www.tascaz.org/dat_testmenu.htm ( copy and paste)
pla-see-bow
to see if the drug is pure
You can buy an over-the-counter test at a drug store.
The sugar pills in a medical test are known as the placebo.