A former substitute teacher in Coquitlam has been acquitted of all sex charges involving young female students.

Aleksandr Plehanov was acquitted on 11 charges, 10 of which involved allegations of sexual interference, while an 11^th was for criminal harassment.

The judge says Plehanov was an ineffectual teacher who was ignorant of, or ignored completely, rules of conduct involving contact between teachers and students.

But he says Crown counsel failed to meet the criteria to prove criminal conduct, and so acquitted him.

The trial involved more than 30 witnesses including the alleged victims, girls 7 to 8 years old.