Gold bars have serial numbers but it's impossible to tell where the metal originated from once melted down. Whereas if you're a criminal trying to sell stolen artwork or a car, if the police catch ...

Nadine Menendez was convicted of teaming up with her husband to accept bribes for help with their business dealings or legal troubles.

Prosecutors described Nadine Menendez as a liaison between then-Sen. Bob Menendez and the contacts who paid him, seeking bribes and sharing in illegal profits.