"investigation" - key terms from Wikipedia

accident investigation
accident investigation and the issuing
air crash investigation
background investigation
balco investigation
bombing investigation
bureau of investigation
cbi investigation
central bureau of investigation
cia leak grand jury investigation
columbia accident investigation board
columbia crew survival investigation report
committee for the scientific investigation
crash scene investigation
crime scene investigation
criminal investigation
criminal investigation bureau
criminal investigation department
criminal investigation division
detective investigation files iv
duties such as accident investigation
federal bureau of investigation
formal investigation
grand jury investigation
internal investigation
investigation
investigation aired
investigation and restoration
investigation branch
investigation bureau
investigation division
investigation into the outbreak
investigation team
kira investigation
kira investigation team
murder investigation team
national bureau of investigation
night investigation
ntsb investigation
official investigation
open an investigation
paranormal investigation
police investigation
preliminary investigation
safety investigation
scientific investigation
special investigation branch
ufo investigation
united states army investigation
watergate investigation