IR - correct answer Random drug testing
IU - correct answer Entire unit
IO - correct answer Valid under specific circumstances as determined by CDR memo
PO - correct answer Robable cause for an individual; Consult JAG first
CO - correct answer CDR directed
RO - correct answer Specimen required as part of pre-approved monitoring
AO - correct answer Mishap or Safety driven
VO - correct answer Volunteer gives Consent; preferably in writing
MO - correct answer Medically necessary for an examination