For Monday's game at Citizens Bank Park against the San Francisco Giants, the Phillies installed a metal detector at the right-field gate.
Until the end of the season, the metal detector will be only at this location. Next season, the Phillies plan to have them at all gates.
"This is our maiden voyage," said Lisa Wilson-Robinson, the gate supervisor. "We think it is a nice added layer of protection."
There seemed to be little delay with fans entering at the gate. Fans with cellphones, cameras, and keys had to have them scanned.