The test is used by the Covenant to monitor those who pass through the settlement, and is administered by Swanson. Officially, the Covenant claims its purpose is to keep "undesirables" from entering; however, it is later revealed that the test was created by Doctor Roslyn Chambers in order to root out synths. Those who "fail" the test - in other words, those who show synth-like behavior—are kidnapped and taken to the Compound, where they are subjected to interrogation and torture.