It can have several possible meanings.
It sounds like a legal request for the forensic chemist/technician who analyzed the evidence OR perhaps a request for the results of the forensic exam itself to be present at trial as a witness. (???)
More would have to be known about the context in which this phrase appears in order to attempt a more precise answer.
Joseph Louis Proust (1754-1826) was an important French chemist, known for the Law of definite proportions.
The law of demand is that when you demand something you MUST say please and thank you, it's the law.
Law of demand is the higher the price the lower of goods demand for
Consumers is the law of supply and demand.
why does the4 law of demand holds
Assuming you mean "chemist shop", then it is known as a Drug Store.
marketing is a great example of law of demand
Robert Boyle of course ! He was a chemist.
the law of demand state there is a negative or inverse relation ship
by the English chemist J.A.R. Newlands in 1865
Dmitri Mendeleev, a Russian chemist, was the first.
Non, Its in law the for them to be open