The added meat, mostly cheap (and very cheap) trimmings, are used to decrease the bone and marrow content to acceptable USDA levels. Although the USDA requires removal of the spinal cord, nerve tissue that radiates immediately from the spinal cord through the intervertabal foramen, and into the peripheral nervous system, is present in the product. Products containing AMR do not require labeling identifying it’s presence. USDA considers AMR to be meat (as opposed to bone, marrow and nervous tissue), enabling AMR to be sold to consumers as “beef”.
Anhydrous Ammonia is approved for use in AMR as an intervention kill step for pathogen contaminated meat. Anhydrous Ammonia (also used in methamphetamine production) is a very dangerous and highly toxic substance that reacts violently with tissue and other substances containing moisture.
From Mike Callicrate’s No Bull Food News Blog