Untested methods

I'm reading an article Ohio executions back on with 1-drug method. Very interesting reading. I forgot about it, but a few months back, there was a botched execution where techs were unable to find a vein in Kenneth Biros. Well, this time the State of Ohio prisons director Terry Collins has a one-drug injection method, which I don't see being any better since one still has to find a vein to inject, right? Anyhow, here is the nuttiest part of the article:

"Death penalty opponents hailed Collins' decision as making executions more humane but expressed reservations about using an untested method."

How do you test an execution method? Seems to me that conducting an execution is the test, ain't it?