Which may increase a person’s risk for joining a gang, despite location or background?
a. attending a poorly performing school
b. being exposed to media that glorifies crime
c. having family members involved in gang activity
d. having a history of a mental health disorder

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?