Cops don't want to enforce nanny state laws... they want to protect the people they serve. The prime beneficiaries of the illegal status of drugs are smugglers and pharmaceutical companies, not the people that most cops sign up to serve. I have had cops in NYC tell me the same thing - their time is far better spent chasing rapists and murderers than junkies and college kids.
Exactly. I've had friends of mine who are Police officer say basically the same thing. The jails are filling up with nonviolent criminals while the rapists, murderers etc are walking around.