From the WND Comments:

not arsenic, the gov’t has a gun that van shoot a person that will leave no ivisable holes, it shoots a frozen type bullet that melts once in the body and causes a heart attack,, they knew Andrew Breitbart had heart trouble and he was out walking when this might have occured, try to Google “Gun that the gov’t has that does this” I do not remember the site but will try to find it, a woman who worked for the gov’t said that this type of weapon does exist. he did not die of natural causes, he knew to much

classic