Sorry to be the bearer of bad news, but markarich159 is right. The FDA enjoys sovereign immunity, and cannot be sued except in specific and extremely limited circumstances. Even where they can be sued, such as in the SE and
njoy case, there is NO monetary relief available. So even if it were possible to find some avenue to sue, which I don't believe exists, there would never be any sort of contingent fee arrangement - those are offered only in cases where the attorney expects to be paid out of a big monetary damages reward.
The following is from Judge Leon's decision in the SE and
njoy case - he did all my research for me.
"It is also worth noting that even if the claimed economic injury did not threaten plaintiffs' viability, it is still irreparable because plaintiffs cannot recover money damages against FDA.
*****************************************************
Absent a waiver, sovereign immunity shields the federal government and its agencies, like FDA, from suit. FDIC v. Meyer, 510 U.S. 471, 475 (1994). The APA, of course, waives sovereign immunity for federal agencies but only in actions "seeking relief other than money damages." 5 U.S.C. § 702. Even though the Federal Tort Claims Act ("FTCA") waives immunity for damages in some instances, it does not do so here. Claims "based upon an act or omission of an employee of the Government ... in the execution of a statute or regulation, whether or not such statute or regulation be valid," as well as claims arising out of "interference with contract rights," both of which would most likely apply in this case, are excluded from the FTCA's general waiver of sovereign immunity for torts. 28 U.S.C. § 2680(a), (h). There being no apparent avenue for obtaining damages against FDA, any economic loss suffered by plaintiffs due to the detention or refused admission of their products can never be recovered and is therefore irreparable."
http://www.casaa.org/files/SE-vs-FDA-Opinion.pdf