Why Was an Ad Criticizing Mayor Bloomberg for NYC's Marijuana Arrest Policy Censored?

New York City has the dubious distinction as the marijuana arrest capital of the world. The mayor's office doesn't seem to want to allow attention drawn to it.

Excerpt:

“Most New Yorkers don’t know that last year, the New York Police Department arrested close to 50,000 people for marijuana possession at a staggering cost of nearly $100 million.”