StacksVerified U.S. regulatory reference

21 CFR §556.100

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)[Reserved]
  2. (b)Tolerances. The tolerance for quinoxaline-2-carboxylic acid (marker residue) is:
    1. (1)Swine. Liver (target tissue): 30 ppb.
    2. (2)[Reserved]
  3. (c)Related conditions of use. See § 558.115 of this chapter.