Marty,
Let me throw another perspective into the mix. You started the conversation by talking about seeing a 15yo and prescribing BCP without the parent's knowledge. Would you prescribe Accutane or Zoloft or any other drug without informing the parents? This idea that doctor-patient confidentiality should supercede parental authority is very problematic. And yes, I know I'm a Luddite! :-) But if you respected parental authority, you wouldn't be having this confidentiality dilemma.