We're building our new home in Idaho and designed it so the door swings open near the tub so the logical place to put the light and fan switches is right next to the tub. What are the options for doing this safely? We have the same problem in the other bath but with a shower only. We will have shower curtains on both rather than doors. We've been told of three different options: tying it into the GFCI, using a motion detector, using a super low voltage switch. We could use more guidance on this. Thank you!

Idaho has adopted the International Residential Code for 2003 for it's electric requirements but may still be using the National Electric Code for 1971 if I understand correctly:

http://dbs.idaho.gov/

At any rate, switches do not need to be ground fault protected under the IRC and NEC in most instances.

Generally speaking, only outlets are required to be ground fault protected in bathrooms.

You should verify this with your local electric code enforcement office to be sure and not take my word for it.

It is a good idea to ground fault protect all electrical devices in a bathroom, but a 'good idea' does not mean it is required by code.