there can always be drug dogs in the airport. i travel a decent amount, though, and the only airport i've ever seen one at was in denver. i always put it in my pocket or if it makes you feel more secure in yer undies. you're less likely to have your person searched than your bags. don't dress like a "raver" or whatever because then you'd be targeted and they'd be more likely to give you shit or search your bags or something. i've done it numerous times at airports in the northeast and never had a problem.
there's also been other posts in the past about this, you could have found one yerself but whatever.
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"i'm no angel, but please don't think that i won't try and try" -dido