My parents called the cops on my older sister while in high school dueto general & consistent "delinquency". They gave her chances, but the final straw was when we returned home from being at my grandfather's death bead for about a week to find that she had broken into the house (she was staying at a friend's) & had a party while we were all gone. The house was trashed, copious amount of underage drinking had happened (as the trash bags full of empties were found in the ditch next to the house), copious amounts of vandalism had happened, & they found a used condom in their bed.
What should be noted, however, is that my folks had to PAY for all the court fees as well as her probation that included mandatory classes. All in all it came close to 100K back in 1998 & almost lead to my folks having to file for bankruptcy.
Knowing that: no, I would not call the cops on my kid for pushing me down after I caught him or her selling pot. However, I wouldn't let them back into the house with their stash if they were dealing. While I would be much more understanding if I found my 16 years old's personal supply of pot, there's no way I'd let them deal out of our house because ultimately, as an adult I'm responsible for it.
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"The Rich are there to take all of the money & pay none of the taxes, the middle class is there to do all the work and pay all the taxes, and the poor are there to scare the crap out of the middle class." -George Carlin