Really radical idea: Repeal the laws that do not have the intended effect.
Gun control doesn't reduce violent crime? Dump it.
Banning drugs doesn't even make the price drop? Legalize them. (Don't tax them so much that you create new black markets. Looking at you New York City and the taxes that are so high it is worth smuggling from Virginia and causing street violence over who gets to sell where.)
IDEFK what problem banning prostitution is supposed to solve. But if you want to reduce human trafficking you have to make sure the trafficked don't need to confess to being criminals to get help.
We should probably also cut the 72,000+ page federal tax code by about 90% too.
Crime in the US is a fascinating beast. We use it as a weapon, as a measuring stick and as a deterrent, all in one. But as any abused child can tell you, after you get punched in the face by dad a few times, the affect starts to warp. You can't destroy someone's life, then expect them to go get a better one in the same breath, while at the same time telling them they're terrible people.
I would love a study to see what happens when you take away Prison to all but the most serious of offenses, and from there you monetize crime. And, let's keep it fair. The rich doing DWIs (DWIs is one of the most annoying crimes on the planet to me) because they don't even have to blink at a $10K fine days are over. DWI will be.. let's say.. restitution to any affected parties PLUS 25% of your gross, tax-write off immune yearly income for 3 years. You make $1 Million Dollars? You owe $750,000 over 3 years. You make $40k? You owe $30k over 3 years. If you keep doing it, it's +15% to a max of 60%. Learn to not drink and drive or go poor. Hardship crimes? Lets say Burglary, theft, non-violent property crimes. These folks are probably already having a hard time. So, Social Program with a deferred penalty. Educate them to the point where they're employable, maybe even state and corporate coop agreements for internships for experience, then the first 3 years of a real job, we take a percentage of their pay for their crime.
Prostitution? The CDC probably declares it illegal to prevent STD spreading. And that's probably not a terrible idea. They mandated STD testing in the Adult Film Industry and they STILL have HIV problems. Arguments can be made that isn't dating just a social form of prostitution, and there is an argument to be had there.. but.. for the moment.. we'll find some new way to regulate sex for money. Maybe license it like medicine or hair dressing.
Human traffickers? Great news. We'll legalize and control the distribution of drugs. Though, we should probably keep crazy hard stuff a no-no. (Humans aren't smart enough to fully monitor themselves.) So, with that out of the way, the DEA is going to have alot of time on their hands. Easy enough! Spin those gun loving fools around and sick them on Human Traffickers.
Murder / Rape / Abuse of a Child / etc. You still go to prison. But we're going to be taking away things. Like Air Conditioning and Cable TV. At least at first. We have a convict work program of some sort. They do a good job, they get good things. They do bad things, they get an outsourced prison term to India.