When all else fails, read the Internal Revenue Code.

"Section 162(c)(2)Other illegal payments

No deduction shall be allowed under subsection (a) for any payment (other than a payment described in paragraph (1)) made, directly or indirectly, to any person, if the payment constitutes an illegal bribe, illegal kickback, or other illegal payment under any law of the United States, or under any law of a State (but only if such State law is generally enforced), which subjects the payor to a criminal penalty or the loss of license or privilege to engage in a trade or business."