The phrase "interrogation process" refers to the series of questions and techniques used to gather information from someone, typically in a detailed and thorough manner. Full definition
Then you introduce some new rules for company meetings, telling your senior staff to put visitors through a modest interrogation process before letting them in. (fortune.com)
IPF has urged law enforcement agencies help identify possible false confessions through the mandatory recording of the entire custodial interrogation process rather than just the individual's detailed «confession,» in order to reduce the amount of wrongful convictions by false confession. (floridainnocence.org)