It seems perfectly simple to measure, and they just need to contain at least that much, so companies would overshoot by a bit to make sure.
If a company claims it contains a litre, and a customer sues, all the company has to do is bring one to court. And have a representative get a litre out in a way that seems reasonable to the judge.
“In a way that seems reasonable to the judge” is hiding an enormous amount of complexity that cannot possibly be adjudicated fairly or with a reasonable expectation that your methods at the factory to test it will be approved in court.
It seems perfectly simple to measure, and they just need to contain at least that much, so companies would overshoot by a bit to make sure.
If a company claims it contains a litre, and a customer sues, all the company has to do is bring one to court. And have a representative get a litre out in a way that seems reasonable to the judge.
“In a way that seems reasonable to the judge” is hiding an enormous amount of complexity that cannot possibly be adjudicated fairly or with a reasonable expectation that your methods at the factory to test it will be approved in court.
That could be argued about every single thing in law, yet law continues to work.