1. Short title This Act may be cited as the Standardizing Thresholds Of Penalties for Fentanyl Act or the STOP Fentanyl Act . 2. Amendments to the Controlled Substances Act Section 401(b)(1) of the Controlled Substances Act ( 21 U.S.C. 841(b)(1) ) is amended— (1) in subparagraph (A)(vi)— (A) by striking 400 and inserting 5 ; (B) by striking 100 and inserting 0.05 ; and (C) by inserting scheduled or unscheduled before analogue of ; and (2) in subparagraph (B)(vi)— (A) by striking 40 and inserting 0.5 ; (B) by striking 10 and inserting 0.005 ; and (C) by inserting scheduled or unscheduled before analogue of . 3. Amendments to the Controlled Substances Import and Export Act Section 1010(b) of the Controlled Substances Import and Export Act ( 21 U.S.C. 960(b) ) is amended— (1) in paragraph (1)(F)— (A) by striking 400 and inserting 5 ; (B) by striking 100 and inserting 0.05 ; and (C) by inserting scheduled or unscheduled before analogue of ; (2) in paragraph (2)(F)— (A) by striking 40 and inserting 0.5 ; (B) by striking 10 and inserting 0.005 ; and (C) by inserting scheduled or unscheduled before analogue of ; and (3) by adding at the end the following: (8) In the case of a violation under subsection (a) of this section involving a mixture or substance containing a detectable amount of N-phenyl-N-[1-(2-phenylethyl)-4-piperidinyl] propanamide or a mixture or substance containing a detectable amount of any analogue of N-phenyl-N-[1-(2-phenylethyl)-4-piperidinyl] propanamide, in which the substance was imported along the United States international border with Mexico, the person committing such a violation shall be sentenced to a term of imprisonment of not less than 20 years and not more than life imprisonment and if death or serious bodily injury results from the use of such substance shall be sentenced to life imprisonment. . 4. Effective date The amendments made by this Act shall apply to an offense occurring on or after the date of enactment of this Act.