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During his stint as a Police Officer, Batman didn't allow Grayson's police-issue gun in the Batcave.
Cassandra Cain deduced Batman's identity in Batgirl #24, when she recognized Batman's body language in Bruce Wayne when he was being arrested for murder and again on a photo of when his parents were murdered.
Cassandra's anniversary of becoming Batgirl was celebrated in Batgirl #33.