When you are put on probation and you break the terms in one way or another, this is known as a violation of probation. This can be a very serious offense, but it could also be considered a minor one. It all depends on what terms of the probation you broke and what consequence it had.
Across the United States, penalties for drug crimes, from drug use to selling and distributing, are slowly but surely being reformed. Much of the time, inspiration on drug penalties can come from European countries. Portugal is one good example. Portugal took the decision in the early 2000's to decriminalize drug use, reinvesting the money saved from jail maintenance into drug rehabilitation programs.
Illegal drug use in public spaces is always a serious offense. However, there are additional laws and policies intended to limit the presence of drug use near children. Therefore, those who get caught using, buying or selling drugs in close proximity to schools or in other drug-free zones are likely to face even harsher penalties than others accused of the same offense.
Search warrants are used to give law enforcement official more freedom to enforce the law.