Is it possible to chemically analyse a cooked meal to detect if it contains human urine

where might you be able to get such an experiment performed?

Urine is almost entirely water, with the rest being left over cells from your body. To confirm urine, one would need to manually search samples under a microscope for human cells, which would be even harder to find because the cooking would have destroyed most of them. It's a lost cause

I supose but it would probably be expensive and pointless as urine is harmless.