We can now test our drinks for the presence of the date rape drug. When might we be able to test our food for E. coli, etc.? See deatil?

Maybe two weeks ago there was news, that a tester has been invented, to help bar patrons test for date rape drug. I am not sure if it only shows whether it is alkaline or acid, and if alkaline it is tampered with. So, do you have any knowledge as to when individuals will be able to test for ecoli salmolina etc. in their food?