How to select a form based on a variable?

I have a series of data collection steps that are required to be followed based on the state that you are in (like Texas, New York, California, etc.)

I need to associate this state-based form with a lab sample depending on which state sent me the sample.

How can I go about doing this?

Also- It needs to be fully supported from a mobile device like a Blackberry, Android phone and iPhone. These are the primary data entry tools not a PC.

Your help is greatly appreciated.