We have examined the attic and the rafters and see  no evidence of a leak anywhere.  

This is from a top UCSF doctor who has written books examining the problems with trials and studies:"Last 15 years an increase appetite for uncertainty at time of regulatory approval for drugs and drug products. 

I would recommend asking for referrals, and don’t just call on the phone - drive by the sites, talk to the property owners, and examine the work that was done.I would also encourage you to ask him if this is his standard way of doing business, or is his upfront money request based on the relatively small cost of the job.

I am a criminal defense attorney in Southern California so I needed to cross examine him in person.