Batman: Vengeance2001

Batgirl:
He was working on some kind of miracle drug called Prometheum. But he lost federal funding. They said Prometheum was too unstable.

the Batman:
Unstable? How?

Batgirl:
I'm not sure, but unstable enough to cause the government to cut funding for his research. This is where it gets interesting. After that, every increase in Evers' bank account was preceded by a major bank-job by the Joker.

the Batman:
Joker was funding Evers' research?

Batgirl:
He's done stranger things.

the Batman:
Not without a punchline. Keep me posted.