In Australia, we have laws against consorting. That is, if you spend time on a regular basis with someone you know to have been convicted of an indictable (read: serious) crime, you yourself can go to prison.
Some people are concerned that this means prison effectively equals isolation for life; state mandated ostracism of someone who might have been rehabilitated. Other people are worried that this means you might well be arrested for doing nothing wrong other than being social.
As for me, I'm a little concerned that the consorting charge is an indictable offence. So I consort, get put away and get out. Then people hang out with me (this is, of course, hypothetical) and then they go to prison. Then they get out. Then their friends and family go away. Infinite regression as criminal law.
That's hilarious.