Fred, I can comment on this only because I have been in a similar situation with my son. It wasn't a blackberry, but same deal.
If he lives under your roof and you are providing food and shelter for him, you (and your spouse) can set the "principles" of what behavior is acceptable or not, be it drugs, alcohol, computer porn or whatever the issue might be. And, you can give him choices that he can choose to make, and then he can deal with the consequences of his (acceptable or unacceptable) behavior you set forth.
PM if you want.
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