MEXICO CITY (Reuters) - Possessing marijuana, cocaine and even heroin will no longer be a crime in Mexico if the drugs are carried in small amounts for personal use, under legislation passed by Congress. The measure given final passage by senators in a late night session on Thursday allows police to focus on their battle against major drug dealers, the government says, and President Vicente Fox is expected to sign it into law. "This law provides more judicial tools for authorities to fight crime," presidential spokesman Ruben Aguilar said on Friday. The measure was approved earlier by the lower house....