What tactics do you use to detect draws?

I have noticed some players are freakishly good at detecting when someone is on a draw.

These are the only tactics I have, and they are pretty basic - I'd like to improve in this area so I can maximize giving bad odds for him to call on the draw, and not letting scare cards scare me so much when hes pretending he hit his non existent draw.

1) The nature of the flop, obviously. Two suited cards and connected cards on the flop obviously set off alarms.

2) Someone hanging around when I have top pair makes it less likely he also has top pair. Obviously he could have a range of hands, like overpair, two pair, trips, or just middle/bottom pair, but it certainly makes it more likely that hes on a draw of some kind.

3) The calibur of the player seems to determine if he'll chase unfavorable draws, weak players will sometimes call on the draw no matter how much I bet, but the average player I think understands pot odds. So if I'm betting into a good player and he is calling despite bad odds for anything but a monster draw, he probably isn't on a draw at all.

4) Has he chased draws before dispite unfavorable odds?

NLHE, sorry.

betting patterns obviously...

if the person before u puts out a small raise and you have enough chips to play around with give him a min. re raise and if he just calls quickly and gives a quick check by the turn, you can assume hes on a draw...if your on early position...give out a value bet...a quick call can mean a draw.