Dealing with thieves in the party

[Zergrusheddie]

Most parties have a Rogue in the party; they do decent melee damage and are excellent for the amount of skills they get. However, I fear that in our current campaign the Rogue will be trying to skim some cash off of the top. Our characters don't know, but we as players will know damn well what's going on.

Is there a way to ensure that the Rogue does not steal from the party? This is an Evil Campaign, so if the Rogue actually steals for the party he is likely to be the subject of Animate Dead rather than Raise Dead.
How have you people dealt with Rogues who seem to be wearing Mithril Chain while everyone else is scrapping for Chain?

The Rogue has not stolen anything yet, and I'm not sure that he will. However, I've had problems with thieves in the group before and it usually ends with people shouting at each other and storming off. This is something I would like to avoid so I'm wondering if there are any precautions that can be made.

EDIT: I suck at the explanation thing. Maybe this will help you help us.

Best of luck
-Eddie