There is a reason Pimps, Dealers bought gold chains versus kept cash. Cash and bank accounts could seized while what your arrested with, such as jewelry, is given back to you upon release.

Need cash on hand, pawn it or use it as collateral for a loan.

It is away around the legal system to retain wealth.

Why couldn't jewelry or other items you are arrested with be seized as well if they can prove (or rather, if you can't disprove) they were bought with ill-gotten gains?