Garbage Burned With Pets in Crematory

At a crematory in Japan, workers have burned garbage together with deceased pets. This has been going on for at least ten years.

The practice was not condoned by the leadership of the chain of crematories. They have made a survey of other crematories, and this practice has only occured at one of them. The workers there seemed to be unaware of the sensitivity, not understanding that humans want their pets cremated without garbage. 

I cannot understand how this practice can have continued for ten years. Luckily, it was just at one crematory, but one is one to much in this case. It is good that it was discovered and that the practice has been stopped.