background investigation

background information

background noise

background check

universal background checks

background radiation

background sound pressure level

natural background radiation

final background sound pressure level

background

background count

background counting rate

background map

Federal Bureau of Investigation (FBI)

International Independent Investigation Commission - Lebanon (UNIIIC)

investigation and intelligence unit (law enforcement)

US Army Criminal Investigation Command

systematic investigation

targeted investigation

accident investigation

Accident Investigation and Prevention Section

accident investigation authority

accident investigation division

crash investigation procedure

safety investigation

safety investigation board

field investigation

air accident investigation

incident investigation

investigation anatomy

investigation authority

investigation tests

postflight investigation