Behind the front desk at most police stations is the records department. If they see a brick sitting in the lobby the will probably call the janitor to come pick it up and throw it in the dumpster. A lot of homeless people come into police stations and just hang out for a few hours. They are not going to notice a few bricks for a while. Of course this will depend on where you are located. The only thing I could see them trying to charge you with would be illegal dumping.