Since 2007 it is forbidden to drink in public, and the situation improved much. I know Mongolia since 2005. The sunday prohibition lasted only some months, but the 1st of month prohibition (and election day +-1 d) still exists and most bars tend to close at midnight.
Drugs... somewhere seen on parties, "green" or "black" smoking stuff, and (probably homebrew) LSD. Druck trafficking is under jail penalty, 1-3 years in Baganuur state prison will cure everyone. There are also the bank robbers, the childish-girl-rapers and murders.