My food smells like pee. Is there any kind of test to check whether there is human piss in my food?

I live with my mother in law. Today I smelt pee in my food. It was white beans I prepared. I boiled it and left them in the kitchen. I left home to church and when I returned home with my children and heated the food. While we were eating I sensed the scent. I kept some in the fridge now I want to test in the laboratory if there is pee in the food. How long can I keep it in my refrigerator before I take it to test.
Asked Mar 25, 2016

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