I was working in a huge textile factory, near Mexico city.
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The government requires effluent chart recorders on plant discharges to compare water purchased vs water discharged.
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The company has 60 hp pumps completely hidden under finished tiled floors to pump in ground well water illegally.
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To hide illegally pumping untreated water out...
The 4-20 ma signal on the v-notch weir to the chart recorder is diverted to a simulator &
@ night they would empty their ponds of illegally pumped in water flipping a small toggle switch to simulate 4 ma = no flow to out the chart.
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Rain water, Sewage & Industrial waste, are all 3 charted as well as city water in.
If it is not raining there had better be no rain flow plotted.
Water in must = water out
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The illegally pumped in water is illegally pumped out & untreated at that.
The city is literally sinking due to water being pumped out of the ground.
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I was there when somebody showed up in an official looking truck to pick up a pile of charts all organized & marked with dates.
He seemed very friendly with the head engineer.
I am sure he knows what is going on.
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All of the emergency exits in the factory were chained shut to prevent employee theft I was told.
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Fire hazards everywhere.
The only way in or out was a narrow door @ the time clock with a guard checking everybody.
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Safety interlocks defeated, doors & skins removed from most machines to speed production.
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I saw all of this & more in only a few weeks.
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Not sure how legitimate law abiding companies can compete...