A headmistress was accused of being "excessive" in her response when pupils were unwilling to pose for a school photograph - by inviting a police officer to reprimand them.
Ann Hughes, who was head of Ysgol Goronwy Owen, a village primary school at Benllech, Anglesey, faces a catalogue of complaints at a hearing of the Professional Conduct Committee of the General Teaching Council for Wales.
The list of accusations against her included that she failed to investigate bullying, shouted excessively, highlighted parents' complaints during assembly potentially identifying pupils, engaged in unnecessary open criticism of children's mistakes, and imposed excessive punishment.
Mrs Hughes failed to create a cooperative working relationship among staff at the school, the GTCW was also told at Ewloe. The hearing is scheduled to last until Friday.
Mrs Hughes was suspended in 2011 and later dismissed.
The school was engulfed in crisis that year when five of the six teachers called in sick on the same day after earlier threatening industrial action following a declaration of no confidence in Mrs Hughes, claiming there was a "climate of fear."