Summary of Changes

Publication 52, Hazardous, Restricted, and Perishable Mail

Effective April 2022, Publication 52, Hazardous, Restricted, and Perishable Mail, has been updated with the following changes:

The chapter, subchapter, part, appendix, or section…	titled…	was…	in Postal Bulletin issue number…	with an issue date of…
Chapter 4, Restricted Matter
453.37	Hemp-based Products	Revised to update the hemp mailer laboratory test result records retention period and add a provision that hemp and hemp-based products, including Cannabidiol (CBD), are prohibited in mailings to international locations.	22579	8-26-21
453.37	Hemp-based Products	Revised to include a correction to the second paragraph of the revision referenced above. The revised text was corrected to read that the maximum mailable limit for tetrahydrocannabinol (THC) concentration is 0.3 percent for hemp-based products.	22581	9-23-21