In the meantime, if you're worried about insider theft, keep your eyes on the guys – the guys in IT or who look like they should be, who drive a little nicer car and go on vacations a little more posh than you'd expect.
Don't expect even successful data thieves to dress more swankily than their colleagues, however.
Honest or not, the skills that advance a geek's career to the point he can be a real danger generally have nothing to do with the ability to dress sharp.
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