Carrying cash isn't a crime. The fact that no charges were brought says that they couldn't prove a crime was committed either. And please read the fifth amendment.
> No criminal charges were ultimately brought against Gutierrez Lugo
No but carrying over $10,000 into the US requires you to declare it and maybe pay taxes if you can't prove its source or risk being sized (which is fine if it's drug money).
> No criminal charges were ultimately brought against Gutierrez Lugo