animal tested metal

The other night I was at this engineering networking session. I had a chat with this chap who used to work in a steel plant in this particular developing country. He shared that in the manufacturing process, carbon monoxide is a by-product which normally is collected and sold to other industries. But somehow, some carbon monoxide still would leak out into the manufacturing plant and some workers would die from carbon monoxide poisoning. The sight was ugly as the casualty's muscles lost tension and his body waste would make a mess. That's besides the point.

As carbon monoxide is colourless and odourless, but lethal, the people in the factory thought of an idea. They brought in animals in cage. These small animals, being smaller in size than human beings, logically would die first before human beings when taking in carbon monoxide. So when the workers saw the animals laying motionless in the cage, they knew something was not right and they would evacuate from the manufacturing plant.

So, not only food and medicine can be tested on animals.