I don't doubt the information, or him, really... But that could be 'confirmation bias', on my part - because of course what he's saying is completely consistent with all of the other information, that we have seen about the lethality of these injections. But when I saw that there were questions about the data - I thought that I should warn you and our community that some issues had been raised.
One of the most subtle and clever strategies for "debunking", is the 'false defector' - or the Karl Rove strategy, that was used against Dan Rather. In that instance, Rove FORGED a document - that was entirely truthful in its content. W really went AWOL. So the story was true and 'checks out' - but the acceptance of the forged document was used to cloud the issues, and demand that Rather be fired. In the end the main point became lost.