Me thinks the media exaggerated a bit on this one. I'm a Taser Instructor and got the memo. In a nutshell- they have RECOMMENDED changing the PREFERRED point of aim to the sternum and lower, citing more effective shot placement, reduced chances of a probe striking the face and throat, and as a means to help AVOID the controversy of whether the shock cause Ventricular Fibrilation or not since the charge would not be in the area. As far as the safety, one of the e-mails cited a PLAINTIFF's expert as estimating the probability of VF from a Taser exposure at 0.00061%, or 1 in 163,934.
I myself have a history of irregular heartbeat which I take medications for. I have received 5 taser drive stuns to the arm, chest, and neck areas, and 4 full body shots to both the chest and back areas, and have never had an issue. I believe whole heartedly that the taser is as safe as any other "tool" in the Law Enforcement toolbox, but not naive enough to think it is the sole answer for every use of force situation.
I think this is the "growing pains" of the taser, similar to what OC (pepper) spray went through in the 80's. When OC was first introduced, there were numerous news reports of suspects dying after being sprayed, lawsuits over excessive force, debates about whether or not it was safe, and today, its as common on a duty belt as handcuffs.
IMHO, taser is not and should not be classified as a deadly force weapon, but should be placed somewhere along the lines of OC spray and the baton.
Joe