Not ever.
Knew a girl who was carrying close to $30k, on the bus to Nogales. Bus was stopped for search and they must've read her body language, because her and another girl were body searched and cash discovered. She was in jail and few days, given probation, and money seized because she couldn't prove where where funds came from. If proven, she was told she could claim it, but still be prosecuted for not declaring.
Knew a girl who was carrying close to $30k, on the bus to Nogales. Bus was stopped for search and they must've read her body language, because her and another girl were body searched and cash discovered. She was in jail and few days, given probation, and money seized because she couldn't prove where where funds came from. If proven, she was told she could claim it, but still be prosecuted for not declaring.