Natural Balance Now Recalling Pet Food Due To Melamine Contamination

The pet food manufacturer Natural Balance is recalling 6 brands of its pet food due to contamination by melamine contamination, the same chemical that was found in the Menu Foods recall.

My question, have these companies been this careless for a long time and now the harsh light is on them, or is this a new occurance?

The chemical, melamine, is believed to have contaminated rice protein concentrate used to make a variety of Natural Balance Pet Foods products for both dogs and cats, the Food and Drug Administration said Wednesday. Previously, the chemical was found to contaminate another ingredient, wheat gluten, used by at least six other pet food and treat manufacturers.
Natural Balance said it was recalling all its Venison and Brown Rice canned and bagged dog foods, its Venison and Brown Rice dog treats and its Venison and Green Pea dry cat food. via Yahoo! Finance.