Here is the report from the Celina Police Department:
The Celina police responded to the Celina Elementary School on Jan. 9 after receiving information about a suspicious circumstance that occurred at 7:50 a.m.
School staff stated that Ron Miller, a resident of Celina and a father of a Celina Elementary School student, had entered the office of the school and conducted his own drill to test the schools response to an active shooter situation. Although Miller did not display a weapon, the statements and actions of Miller were aggressive and created panic and fear among the school’s staff.
A warrant was issued for Miller’s arrest and he was taken into custody at 9:45 p.m. on this date. Miller is charged with Terroristic Threat, a felony in the 3rd degree with a bond set at $75,000.
City of Celina website: celina-tx.gov.