More from the article ...

... In an interview with CNN's "State of the Union," Homan indicated it was possible the agency's vetting process had failed after an ICE agent involved in a fatal Maine shooting was revealed to have abuse allegations from two ex-wives and, at one point, an order to relinquish his firearms.

"If those are facts, I don't think he should have ever cleared vetting," said Homan, adding an internal affairs investigation is underway. "How did the vetting process fail? Was that information not available? Did they not know?" ...

@#1 ... How did the vetting process fail ...

Possibly because the process may have been designed to sign-up as many persons as possible, as quickly as possible?