Rash,
In some cases misused I would agree, but you could say the same thing about mace. Saying that officers "often" misuse tasers is a blanket statement.
Unconstitutional - how?
I wish they had more deterrent's for assholes, but had a better system for acknowledging injustice when it happens. The overburdened court system doesn't seem to be working.
It is just not reasonable for a department to have access to translators of every language.