This isn't much of an article. The Houston Croncile has a story here:
http://www.chron.com/disp/story.mpl/headline/metro/4766843.html
No, he was not charged. A "level three terror threat" is not a legal term in Texas. The offense is Terroristic Threat
§ 22.07. Terroristic Threat
(a) A person commits an offense if he threatens to commit any offense involving violence to any person or property with intent to:
(1) cause a reaction of any type to his threat by an official or volunteer agency organized to deal with emergencies;
(2) place any person in fear of imminent serious bodily injury;
(3) prevent or interrupt the occupation or use of a building, room, place of assembly, place to which the public has access, place of employment or occupation, aircraft, automobile, or other form of conveyance, or other public place;
(4) cause impairment or interruption of public communications, public transportation, public water, gas, or power supply or other public service;
(5) place the public or a substantial group of the public in fear of serious bodily injury; or
(6) influence the conduct or activities of a branch or agency of the federal government, the state, or a political subdivision of the state.
(b) An offense under Subsection (a)(1) is a Class B misdemeanor.
(c) An offense under Subsection (a)(2) is a Class B misdemeanor, except that the offense is a Class A misdemeanor if the offense:
(1) is committed against a member of the person's family or household or o
therwise constitutes family violence; or (2) is committed against a public servant.
(d) An offense under Subsection (a)(3) is a Class A misdemeanor, unless the actor causes pecuniary loss of $1,500 or more to the owner of the building, room, place, or conveyance, in which event the offense is a state jail felony.
(e) An offense under Subsection (a)(4), (a)(5), or (a)(6) is a felony of the third degree.
(f) (deleted)
(g) For purposes of Subsection (d), the amount of pecuniary loss is the amount of economic loss suffered by the owner of the building, room, place, or conveyance as a result of the prevention or interruption of the occupation or use of the building, room, place, or conveyance.
Possibly "level three" meant (a)(3). Making a threat that causes the emptying of a High School is almost always a State Jail Felony, because when you add up the cost of the security response the school puts on, the salary paid to teachers and administrator who are not doing their regular job, food discrarded if cafeteria service is disrupted, and the like, and you get over $1,500 real fast.
I understand school officials are jumpy, but this makes schools look bad.
The school district in this case is another posterchild for “stupidity gone to seed,” and all the ideas districts across America have come up with have only served to hurt kids, not stop psychopaths. So far, all they have managed is window dressing for the parents who should, instead, be gathering at the doors to the School Board with lanterns and pitchforks asking hard questions about where their taxes are going and what qualifies the administrators to make these "hard" choices. Sounds like the hard choice in this case was as easy as falling off a log and took about as many brains.