This approval is based on demonstrated proficiency in tests conducted by the Bureau of Laboratories of the Pennsylvania Department of Health. Screening analyses provide a presumptive indication that a controlled substance is present.
Confirmatory testing is used to substantiate screening results.
They should also determine that the director of the facility is agreeable to performing analyses for forensic purposes. Persons seeking the analyses are responsible for specifying the extent to which the presence of a controlled substance is to be verified. That specification should be predicated upon the purpose for which the analysis is being sought. The list of approved laboratories will be revised semiannually and published in the Pennsylvania Bulletin . Quality Assurance Copyright 2001 Commonwealth of Pennsylvania.