The drug dealer is paying these federal taxes today -- they're embedded in the price of the item today.
It is generally agreed that with the FairTax, the employee will get his share of SS and Medicare in his paycheck, plus what would have been with held under the income tax. So business has no savings to pass on there, plus the 30% FairTax will be added to the final price of the good or service,
The agreed-to figure is around 8% (for domestic corporations only), but even that may be high.