No one knew or saw how The Batman Who Laughs had appeared in the prison beneath the Hall of Justice, disguised as a transgender villain and sent in by Joker's men.
As one of the Batwomen, and after being infected by the Joker Virus, which had broadened his "way of thinking," he clearly recognized his past weakness.
Once someone passed Batwoman's trust assessment, his suspicion toward them would drop by a level in the days that followed.
Take Barbara, for example. As the daughter of Gotham's police chief, she had followed Batwoman for so many years, and the torment she had suffered proved that her stance was unwavering.
She had proven herself, and Batwoman could not possibly demand that she prove her justice every time they met. That was normal. As a mortal, one would always develop habits and a sense of familiarity.
Batwoman was no exception.
The Batman Who Laughs had naturally remained in Gotham. He was Batwoman—where else could he go?
So when Joker began moving and kidnapped Barbara, The Batman Who Laughs discovered something amusing.
Joker had trapped Batgirl in the park, then had "Jane Doe" imitate Barbara. At a glance, it was obvious he intended to infiltrate the Justice League and cause trouble.
DC was full of all kinds of chameleons. There were many villains skilled at imitating others, such as Clayface. If the distance was too great, even Superman could not distinguish him through his heartbeat and breathing.
However, his disguise abilities were actually among the weakest. Batwoman had recruited him. Clayface was a Mercenary, so he charged for his work, but Batwoman was not short on money.
There was also "Onomatopoeia," a serial killer who specialized in murdering Superheroes. He could imitate every sound in the world. As long as he wore the proper