A forensic lab doing things with DNA may have no business relationship whatsoever with any covered entity (in fact I would guess that this is the most likely case).
In the case of a police department collecting DNA data for analysis by a police forensic lab there is no covered entity involved.
Other entities besides most state and local law enforcement that often have medical data but that are not covered by HIPAA include most private employers, state agencies such as child protective services, and most schools and school districts [1].
[1] https://www.hhs.gov/sites/default/files/ocr/privacy/hipaa/un...