That guy had a WISP.  "Walk In Substitute:  Plane."  

In a letter to employees sent August 23, IRS Commissioner Rettig wrote that the agency would conduct risk assessments for each of the IRS’s 600 facilities and evaluate whether to increase security patrols along building exteriors, boost designations for restricted areas, examine security around entrances and assess exterior lighting.

Everyone was too polite to ask him what he was going to do about drones.