TMZ has learned ... Michael Jackson's weakened state during various concert tours throughout his life -- as well as preparations for the Londres concerts that never took place -- could become powerful evidence in the defense of Dr. Conrad Murray.
Sources connected with the criminal case tell TMZ ... there's "compelling evidence" that MJ was in weakened health whenever he went on tour. Specifically, people who went on various tours -- including the "Bad" and "Dangerous" concerts -- say Jackson was frequently "dehydrated, medicated, and sleep-deprived."
Just like with Dr. Murray, Jackson had a...
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