Third trial starts for Perez in 2004 child throat slashings

Prosecutors play on horror of crime that left three children dead; defense says evidence is thin

Romantic squabbles in Policarpio Espinoza Perez's large Mexican family helped lead him to slash the throats three young relatives, prosecutors claimed Tuesday, seeking to establish a motive early on as the state again tries for conviction in a case that has defied explanation for years.

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