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.
By Brady Dennis and Ariana Eunjung Cha By Brady Dennis and Ariana Eunjung Cha January 2, 2014. On Wednesday, Colorado became the first state to allow legal sales of marijuana for recreational use. Washington state will do the same this year, and other states might follow suit. Here are answers to some basic questions about marijuana, its effects on the body and the issues raised by legalization: