A) No, money may be laundered for any number of reasons, such as when someone doesn't want their legitimately-earned money tracked when they buy an illegal plant (that should also not be illegal) for medicinal or even recreational purposes.

B) If one wishes to launder money because they stole it from someone, then the act of theft is the crime, not the act of laundering money. 

 The act of laundering money after theft is part of the crime. It is meant to conceal the theft. It is not separate from it.

And clearly I've given no thought to buying drugs without getting caught.