Taser Hits Back at Amnesty International  NEW YORK (Reuters) - Stun gun maker Taser International  Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TASR.O target=/stocks/quickinfo/fullquote"&gt;TASR.O&lt;/A&gt; on Tuesday accused human rights group Amnesty  International of ignoring independent reports showing the  company's weapons to be safe and effective.