I have always used certified labs.  However what "certified" means depends on what your testing.  One of the more common certifications is A2LA ISO/IEC 17065, there are others such as NELAP, proficiency testing, FDA Interstate Milk etc. 
 
I don't know how it would effect points if your lab is not certified.  But they should be going through some type of testing to demonstrate their competency. 
 
If I recall correctly your doing packaging and the most common labs for that kind of testing is Bureau Veritas, Intertek, UL, and I believe SGS.  The first three are all properly certified. 
 
					
					
					
							Edited by Snookie, 06 August 2014 - 06:32 PM.