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.
Over subsequent decades, Congressman Harrison's law was revised to be more and more restrictive, and state laws were patterned after the Harrison Narcotics Tax Act. In 1922 the Federal Narcotics Control Board was established, and in 1924 the Heroin Act illegalized manufacture of that drug. The Bureau of Narcotics was established in 1930, and in 1937 the Marijuana Tax Act made pot virtually illegal, under claims reminiscent of the Harrison act debate -- that marijuana was leading the less civilized races to murder, insanity and death.