In Batman Begins, Henri Ducard (Ra's al Ghul) meets Bruce Wayne inside a jail. How did he manage to enter the jail? He isn't a jailer nor his lawyer.
He's head of the League of Shadows he can do pretty much anything he wants.
It seems very likely that he bribed the guards in the Bhutanese Jail where Bruce was being kept.
Recall, he was waiting for Bruce in solitary confinement (where Bruce has only just been sent)....and the guards don't seem to worry about him being there...they even open the door for him.