speeding, littering, loitering, march madness pools( its illegal but millions do them year after year so no one cares)  jay-walking , littering, graffiti stuff, using a handicapped tag when you aren't, ooh and claiming State resident to get a cheaper tuition rate, ahh, what else... double parking, parking in loading zone, claiming your kid is 7 and just tall for his age, lying about your age so you can buy beer/wine/cigarettes, getting someone to buy the same for you.... 

all 'illegal' ... 
criminal behavior?
deport 'em?
hang a gps monitor off of 'em 
or throw them in a detention center?
I don't think so...
sorry, couldn't resist...