Examining (10)
(Other definitions for testing that I've seen before include "Subjecting to 15 ac" , "... conducting exam" , "Trying out" , "stressful" , "Examining" .)
(Other definitions for vetting that I've seen before include "Checking reliability of" , "Carefully checking" .)
'examining' is the definition.
(inspecting is a kind of examining)
This is all the clue.