Why not just use mules (if that's the right term)? The world has no shortage of desperate people who will jump at the chance to earn a few bucks "working from

Why not just use mules (if that's the right term)? The world has no shortage of desperate people who will jump at the chance to earn a few bucks "working from home," where they help "hardworking businessmen between banks" move money. Perhaps the excuse is different and culture-specific, but peoples' inclination to look the other way when they think it benefits them is universal.