Are tasers legal in all states?

Answer 1

Actually, the answer above is incorrect -- they are legal in most states even for consumer use.

Here is a summary of all states, the relevant statute, the legal status of taser guns, and any other restrictions: http://www2.taser.com/SiteCollectionDocuments/Controlled%20Documents/Legal/statestatutesummary.pdf

As a side note, "tasers" is actually the tradename for a general class of weapons called electronic control devices or ECD's.

Answer 2

Only for use by law enforcement officers who are certified in the use of a taser. Many states do not allow civilians to possess or use a taser (but some do!).