There’s a weird dynamic in bribes. If I offer you a bribe and you don’t take it, I can still claim that you did. Or I can muddy the waters by claiming that you asked for it.

One idea I’ve seen is that it should be legal to accept a bribe but not offer or solicit one. On taking the bribe, your legal protection is conditional on handing over the bribe to the appropriate authorities. There’s still some game theory at work, but you’ve at least given people that are susceptible to bribes some additional power.