The artist, who missed scheduled gigs in Boston, was taken into custody with three others at the Lewiston-Queenston International Bridge.
Berreth, 29, was last seen on a neighbor's surveillance camera with her year-old daughter, Kaylee, and her fiancé, Patrick Frazee, outside her home on Nov. 22, police said.
The U.S. Naval Academy will ban people who are transgender from attending the school, beginning with the 2020 school year.
"It's hard to say exactly what his intentions were ... we don’t know exactly what his mind-set was."
The ride-share company is rolling out new push alerts that will remind riders to check their Uber driver's photo, license plate and vehicle model.