In 2004, 10 workers were killed in a steel factory outside Delhi when the scrap metal they were melting down in the furnace caused a blast.
The consignment was later thought to have included war scrap from Iran.
This led to the government considering a complete ban on the use of scrap metals from war zones in this trade, but four years on, the law is yet to be implemented.
In June this year, two boys were injured in an industrial estate in Tamil Nadu when they were handling old cartridges while looking for metal in a scrap pile.
The authorities seized the bags of ammunition and an investigation has been ordered.
But for those involved in the trade, the health risks continue to be more than ever before.
The scrap prices for iron and steel have doubled in less than a year, as rising world metals prices stoke demand for scrap.
That is proving to be big business for Indian companies who specialise in melting down everything from used cars to unused missiles.
A lot of that trade happens in an old industrial estate in Western Delhi called Mayapuri.
Small traders have set up shop along dirt roads and most of the shops overflow with metal waste: bits of old refrigerators, mangled iron from demolished buildings, machinery components, tractors, even children's bicycles and car doors find a place here.
As a group of men saw through a car, the engine falls out onto a puddle in the middle of the road.
They then haggle loudly to bring down the price for the various parts of the car that has just been taken apart. One picks up the headlights, another carries away the seats while the third bags the engine.
Within minutes, nothing of the old car remains. Everything has a price and use in this market.
The easiest metals to recover are iron and steel and these account for the bulk of the trade at Mayapuri.
Pawan Kumar's family has been in the business for generations. Buying scrap metal from traders who import it from foreign countries, he gets it weighed and sorted to sell to bigger dealers and foundries.
Sitting on a platform of old car doors piled on top of each other, he keeps a watchful eye on his workers as they clear the dirt and waste from bags of metal that have just been brought in.
They are hunting for anything that can be re-sold. One man uses his bare hands to pull cables apart and to break bits of plastic off automobile parts. Another uses a hammer to break bigger metal rods.
When the metal comes in it is a mixture of the pure metal and impurities such as bits of demolished buildings that have not been separated from the metal.
Segregating it brings in more money as the foundries they sell to can put it directly into furnaces to melt it down.
"I have been doing this for over 15 years and it's a highly volatile market," Mr Kumar says.
"I buy a lot in one price and by the time it's segregated and ready to be resold the prices have gone up again."
"Steel prices keep going up. There is a lot of money to be made but it's risky business."
At the Star Wire factory in Faridabad outside Delhi, scrap metal is being melted to make stainless steel.
As the bags of scrap go into the furnace, the high temperature melts them down and fuses them into a bubbling liquid.
The furnace is then tilted to pour it into huge vats to cool, after which it is poured into moulds to make identical ingots of clean metal.
Nearly 4,500 such foundries operate in India, melting down waste to feed the ever-increasing demand for metal.
A substantial amount of the scrap comes from war zones such as Iraq and Afghanistan.
War scrap is cheaper because most developed countries have banned imports from war zones while others have stringent rules for import.
"It's important that we get this scrap. I know it's from war zones but as an industry we are mature enough to self-regulate," says S K Goel, director of Star Wire India.
"Whether it's from Afghanistan or Iraq, we can get it checked while loading at the port of origin."
"There is so much demand for metal in India that we simply cannot do without this constant source of scrap."
Booming construction across the country is one of the factors driving the scrap industry in India.
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This is fascination. I work at a mill in Calgary and a lot of our metal is sourced to India, I wouldn't be surprised if it was coming from these scrap metal places in India.
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