200 C Street, S. W.
Washington, DC 20204
January 8, 1997
TO: All Regional Food and Drug Directors
Attn: Regional Milk Specialists
FROM: Joseph M. Smucker, Chief
Milk Safety Branch (HFS-626)
SUBJECT: Implementation of IMS-a-34
IMS-a-34 (under date of July 12, 1996) set January 1, 1997, as the effective date for implementation of proposal #211 from the 1995 National Conference on Interstate Milk Shipments. This proposal required that any test performed to fulfill the provisions of Sections 6 and 7 of the Grade A Pasteurized Milk Ordinance (PMO) for testing raw and pasteurized milk for drug residues must be capable of detecting at least 4 of 6 beta-lactam drugs. This effective date was established and announced with ample time given for conversion to an accepted test; therefore, there is no grace period.
The January 1, 1997, effective date also included time for the evaluation of the Difco BSDA. However, at this time, the Difco BSDA is not in conformance with IMS-a-34 and is no longer an acceptable test for official monitoring of raw and pasteurized milk for drug residues.
Laboratories that were using this test must now be using an accepted test. Certification for acceptable test(s) may be obtained through a Milk Laboratory Evaluation Officer (LEO) by a successful on-site evaluation or through successful analysis of beta-lactam split samples.
Testing for drug residue(s) in compliance with the provisions of Sections 6 and 7 of the PMO may be accomplished by use of any accepted Appendix N test for raw milk or an accepted Section 6 test for raw and pasteurized milk.
Copies of this memorandum are enclosed for distribution to District Milk Specialists, state milk regulatory agencies, State Laboratory Evaluation Officers and State Milk Rating Officers in your region. This memorandum is also available on the FDA Prime Connection computer bulletin board system, and should be widely distributed to representatives of the milk industry and other interested parties.
Joseph M. Smucker, Chief
Milk Safety Branch