Quote Originally Posted by SergeMak View Post

Amphetamine - Wikipedia, the free encyclopedia

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Dependence, addiction, and withdrawal

Addiction is a serious risk with heavy recreational amphetamine use, but is unlikely to arise from typical medical use.[13][27][28] Tolerance develops rapidly in amphetamine abuse, so periods of extended use require increasing doses of the drug in order to achieve the same effect.[62][63]
Why did you highlighted the line about tolerance? Tolerance means temporal insensitivity to a drug.
You've omitted withdrawal symptoms, winch are nothing like those usually described when talking about "maidan drugs" (amph barely causes physical addiction, only after long period of abuse).

Quote Originally Posted by SergeMak View Post
Amphetamine is actually used in medical practice but it is heavily regulated in most countries. So what a sample do you need? A sample of a regulated but still legal medical drug which must be used only by a highly professional medical personnel in very controlled order? Suppose, you found such a drug, how can you be sure it was not misused?
Sample of tea or food or whatever, or, if doctors diagnosed "drug addiction", there should be traces in blood. There's no generic "drug addiction" and "withdrawal" diagnosis.