Mr. Damien McCallion:

The process is set out in the explanatory letter. The circumstances are a little bit more complex. There are a number of labels involved. Temporary labels are applied to the slides and later removed. That was a factor. As the letter is a number of pages long, that is the short version. The college may wish to speak to the process. Some of the labs had permanent labels. That contributed to the confusion. When this was spotted and pointed out, it was then corrected.