Mexico's investigation into the abduction and apparent massacre of 43 students last year is plagued with errors and omissions and key parts may need to be redone, a review of the evidence shows.
The government's team lost evidence, did not properly investigate some leads and failed to provide scientific proof to back up its account that the students were abducted and incinerated and their remains dumped in a river, lawyers familiar with the case documents say.
The government says its investigation is thorough and proves the students were murdered by a drug cartel in league with corrupt local . . .
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