The vast majority of the speculators live and work here in the U.S. It would be easy enough to round them up and start looking into their financial transactions.
And what? What if they don’t have anything funny going on? There’s nothing illegal about being a speculator on the commodities market. Or should we just use the IRS as a weapon on them a la Nixon and Clinton? Just make their lives miserable until oil costs what we want it to, where should we draw the line? $60 a barrel? $40? How about $10? That’ll really learn em.