The "VeriChip" which is what the article is referring to has recently been proven it can be cloned.
"I will briefly describe the steps that I went through to duplicate an ID-only RFID tag using my proxmarkii device. We will be cloning a Verichip, which should not rationally make any of this more interesting but does."
http://cq.cx/verichip.pl
Apparently the company that just had two of their employees 'chipped' was not aware of that fact.
"No one I spoke with at Six Sigma Security or at CityWatcher knew that the VeriChip had been hacked," said McIntyre, author of a chapter titled "Hacking the Prox Card" for Simson Garfinkel's recent "RFID: Applications, Security, and Privacy."
"They were also surprised to hear of VeriChip's downsides as a medical device," he added. "It was clear they weren't aware of some of the controversy surrounding the implant."
http://worldnetdaily.com/news/article.asp?ARTICLE_ID=48760
"The "VeriChip" which is what the article is referring to has recently been proven it can be cloned. "
Oh, but don't worry. They will put in some safeguards against this. In fact, they will get the Internet Explorer browser developers to implement the security protocol.
The we know it could never be hacked. </sarcasm>