Violence For books rated Teen (T), intense or strong depictions of violence may be allowed. Gore must be brief and infrequently depicted. Sexual violence is not allowed unless implied or referenced. Depictions of blood are allowed if it isn't too gratuitous. Violence without injury detail is virtually unrestricted.
Language For books rated Teen (T), multiple instances of swear words except the F- and C-words (such as "b*tch", "sh*t", "slut", etc...) may be permitted. Heavy usage of swear words is not permitted. Derogatory slurs (such as "f****t" and "n****r/n***a") would need to be justified by context, and again, should be infrequent in use.
Sexual Content Books rated Teen (T) can contain sex scenes if they are brief, implied, or infrequent -- consider closed door depictions of sex. Sexual references or humor can be allowed if they aren't too graphic or crude. There should be no graphic depictions of on-page sex.
Drug Use For books rated Teen (T), drug use may be allowed if it's implied or brief and not graphic. Depictions of smoking and alcohol use is allowed.