North Carolina in is the process of updating its laws regarding computer forensics and cell phones forensics. The change provides for a separate license for Digital Forensics Examiners.
Here is the bill sponsored by Senator Snow for the 2009-2010 session.
Amend Private Protective Services Act.
You will want to look at section 5a.
I think North Carolina has created the best model for this type of licensing as it does the most to protect the public from people claiming to be digital forensics experts while at the same time, taking into account the people who should not be required to have a license to do their jobs.