Interestingly, the Oxford English Dictionary
lists both "tase" and "taser" as acceptable forms of this verb. Below is the defintion for -- and examples of -- "taser" as a verb.
Brit. /ˈteɪzə/ , U.S. /ˈteɪzər/
also with lower case initial.
< Taser n.
trans. To use a Taser on (a person); to subdue or incapacitate using a Taser.
1976 N.Y. Times Mag.
4 Jan. 31/3 When an attacker has been ‘Tasered’, the muscles in his body involuntarily contract; he is virtually helpless and may experience pain.
1993 B. Cross It's not about Salary
325 High on PCP and breakdancing in the street, [they] tasered him four times and he died.
2002 Edmonton (Alberta) Sun
(Nexis) 21 July 21 City cops couldn't say last night if tasering a woman allegedly resisting arrest yesterday was justified, but a couple who saw the incident believe excessive force was used.
(London ed.) 19 Sept. 11/2 A student was Tasered after asking too many questions at a university forum with US Senator John Kerry.
Third edition, September 2008; online version December 2011. <http://www.oed.com/view/Entry/271927>; accessed 29 December 2011.