as in the case of professional licensure,prospective experts' certification or membership in professions adds to a competence and is routinely included in the proffering of an expert's credentials to the court before presenting expert testimony. as with the matters of licensure,academic degrees, continuing education, and prior consultancies, membership in pro-fessional associations is subject to the gathering of references from the expert's professional peers.this verification is an important and useful quality-control check.