arggh.... friggin' annoyin.
i concur.
when this has happened in the past,
1) i say to myself... just chill!.... why should some dirtbag ruin your day, let alone ruffle yourself for a half and hour or so.
is it worth it? hellzzz no!
save your energy for those who really need your efforts.
2) it'a a great time to practice that "even-tho-you(the drug seeker)-are-time-sucking-me" i'm gonna be respectful, calm and cool, and clear as i give you a big fat look in the eye and say a solid, "no is no."
you could give some sarcatic remark, but why hassle the poor laddie and lower yourself?
3) if you're really sure this dude is jivin' with yas, finally say outloud, "if you really need the meds, i need to let the authorities (and the hospital administration) (and my superiors) <--(use more people if he's/she's a tough leech to remove)....i need to let them know that you've been actively seeking pain medications. we can get you help(!), we really can.
or
i've asked you to understand that we will not give you any more pain meds, but you keep persisting. To that end, it's a fine time to seek more people to get involved. look we can even DOCUMENT IT, why don't we do that. you can sign too. then we can really find someone to get to the bottom of this."
hmm.... has worked in the past.... but then again, every case poses its unique challenges.
best of luck.