Law enforcement agencies

FILE - In this June 10, 2016, file photo, Officer Caesar Goodson, center, leaves the courthouse after his trial in the death of Freddie Gray in Baltimore. A Baltimore police officer involved in arresting Freddie Gray, who later suffered a fatal injury during a police van ride, testified at the driver's disciplinary hearing Tuesday, Oct. 31, 2017 that Gray did not show any signs he needed medical care when he was first put into the van. Officer Edward Nero testified at the hearing for Officer Goodson, the van driver who could be fired for violating department policies in the case. (AP Photo/Jose Luis Magana, File)

This undated photo provided by the St. Charles County Department of Corrections in St. Charles, Mo., via KMOV shows Sayfullo Saipov. A man in a rented pickup truck mowed down pedestrians and cyclists along a busy bike path near the World Trade Center memorial on Tuesday, Oct. 31, 2017, killing several. Officials who were not authorized to discuss the investigation and spoke on the condition of anonymity identified the attacker as Saipov. (St. Charles County, Mo. Department of Corrections/KMOV via AP)

FILE - In this June 10, 2016, file photo, Officer Caesar Goodson, center, leaves the courthouse after his trial in the death of Freddie Gray in Baltimore. A Baltimore police officer involved in arresting Freddie Gray, who later suffered a fatal injury during a police van ride, testified at the driver's disciplinary hearing Tuesday, Oct. 31, 2017 that Gray did not show any signs he needed medical care when he was first put into the van. Officer Edward Nero testified at the hearing for Officer Goodson, the van driver who could be fired for violating department policies in the case. (AP Photo/Jose Luis Magana, File)

Authorities investigate the scene near a covered body on a bike path after a motorist drove onto the path near the World Trade Center memorial, striking and killing several people, Tuesday, Oct. 31, 2017, in New York. (AP Photo/Bebeto Matthews)

Erica Bailey, daughter of Aaron Bailey, wipes a tear during a news conference, Oct. 31, 2017, in Indianapolis. Two Indianapolis police officers won't face criminal charges for the June shooting death of Aaron Bailey, who crashed his car while fleeing from a traffic stop, a special prosecutor announced Tuesday. (AP Photo/Darron Cummings)