The article states: “He's admitted to burning the kids […]”
Freshwater has, in fact, very adamantly stated that he never harmed any students. Take for example the statement he made to the Mount Vernon Board of Education on August 4, 2008: “I have never, never, branded or burned a person.” (Source, YouTube - "John Freshwater August 4th 2008 (part 7 of 7)" )
Although the allegation of the Tesla coil burn resurfaced, it is an issue that was already officially resolved by the school in January 2008. Other teachers at the school also allowed students to touch the spark from the Tesla coil without causing any harm to the students. (See my article "Accountability in the Media: Tesla Coil Matter Was Officially Resolved January 2008")
The allegation regarding talking about the issue of homosexuality in class: This is an allegation made by just one person—Jim Stockdale. Freshwater’s response to it was that he never made the statement that Jim Stockdale credited to him about gays; Stockdale may have overheard a conversation Freshwater had with other teachers regarding a magazine article about the gay gene. (See my article "Accountability in the Media: John Freshwater: Investigation Didn’t Follow Contract")
As far as Freshwater’s teaching abilities go—his students met and exceeded state standards on the OAT test. (See my article "Accountability in the Media: Re-teaching John Freshwater’s Ace Students")