It is only targeted inasmuch as each test pertains to a single subject.
Drug testing is standard and I'd suggest you look into the VAST AMOUNT OF PUBLICALLY AVAIALABLE procedural documentation on the topic.
If by standard, you mean all event participants are tested, this is the real world and things cost money. Further, is is ignorant to thing those testing want to catch dirty, they hope they NEVER catch another dirty sample.
It is intended to be a preventative process, not a punitive one.
Dummy.