One way is to keep your valuables hidden from maids,always locked in drawers,cupboards,etc.
never leave the maid alone in the house while all members are away.
its not that all maids trap men if they are alone in the house at that time.
in careless families they can trap,if the family doesnt take care of a few things and is too free and open in their talks/actions while the maid is around
never discuss money matters in front of maids,abd never let your maids clean your almirahs,cupboards,etc,even if they are old "trusted" maids.By seeing the things in your cupboards,they get an idea of your status.
Similarly if you have jewels and cash inside the locker of your almirahs,always lock the room before opening these,if you need any cash,jewels.
If you have marriage function in the family and few guests are coming to see your prepartaions,ie,the gifts which you plan to give to people,never call the maid at that time.
Prepone/postpone her program,so that when she steps into the house,the work of "showing your preparations" is already done/will be done after she leaves.
These are a few ways..