Insurance for Examiners, Experts and Labs

Hello Everyone,
I have recently been reviewing the insurance policies for our offices and it seems it is very hard to find an agent that "Understands" the practice so I though it would be a great discussion here.

I currently hold
General Business Insurance
Errors and Omissions 2-Million
Disability

My question's to the group are these.
Has anyone found an agency that specializes in our field.
What types do you have for your business.
Is there aznything else that should be considered as far as insurance.
Is there insurance carriers for Expert Witnesses?
Anything else on this subject to add?