How can you tell if your microwave has a radiation leak?

I don't have any problems using a microwave neither am I scared of using one. But how can I tell if it is leaking radiation? And what could happen if it does?How can you tell if your microwave has a radiation leak?
"...buy a leakage detector (for $40 detectors are out there) or a simpler portable detection home test kit for microwave leakage like this http://www.testcountry.com/products.html鈥?/a>

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Please note that the above detector kit is not certified by any government regulatory agency and therefore the manufacturer can make any claims they want - similar to the claims seen on "supplements" sold at the drug store."How can you tell if your microwave has a radiation leak?
http://en.wikipedia.org/wiki/Microwave_o鈥?/a>