It represents the time from the end of ventricular depolarization to the start of ventricular repolarization. ST elevation may indicate myocardial infarction or pericarditis. ST depression may indicate ischaemia.
Marijuana has been illegal for less than 1% of the time that itâs been in use. Its known uses go back further than 7,000 B.C. and it was legal as recently as when Ronald Reagan was a boy.The marijuana (hemp) plant, of course, has an incredible number of uses.arijuana has been illegal for less than 1% of the time that itâs been in use. Its known uses go back further than 7,000 B.C. and it was legal as recently as when Ronald Reagan was a boy.
In the 1960s, marijuana use became a popular drug of choice among white Beatniks, and stricter penalties for marijuana offenses were passed under the Comprehensive Drug Abuse Prevention and Control Act of 1970.hat may be surprising is that many of these illegal drugs were first introduced by doctors as legal over-the-counter and prescription medications. Hereâs more about the history of illegal drugs in America.