Potentially, too many crooked eyes on the conv. floor watching as you whip out your $5K wad to make a buy. Could follow you outside and stick a gad in your ribs for what you have left. And going thru airport TSA check in, you might get flagged carrying $5K on your person, as derived from a drug transaction. Plastic is much safer. Many sellers accept it and any buys you make via paypal give you protection. Not that I'm paranoid, just looking at the downside.
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