The fact that the medical professional is concerned at all about GV privacy should be enough to clear them of any wrong doing "if" someone were to data-mine their conversations. The probability of this occurring with GV is slim to none, though that's a different story with voicemails. GV has a direct connection that isn't recorded when two people are talking, but is recorded and transcribed when a voicemail is left. So as long as the clients aren't leaving voicemails containing PT info on the dr's GV then they should be good.