Of course they can.
A warrant only applies if you don't consent to the search. If you don't want them to look, you can not give them the password, and withdraw from the process.
It's like your medical records. HIPA says that they can't access them without your permission. You don't have to give them permission, and they don't have to hire you.
Citicop.
Sometimes there's Justice...
and sometimes, there's Just Us
1*
In memory of DCLaw- EOW@RealPolice 02-20-2007.
We won't rest 'till we find the mutt.