But wasn't it said by the Pathologists at the beginning of the trial (Post Mortem) that in Helen's hair - Zopiclone showed she could have been drugged as early as December 2015.Sounds like they're trying to prove that Helen's symptoms had started before IS got the sleeping tablet prescription, but of course he may have been using his 2010 stash first and only gone to get another prescription when they ran out.
Edited to add further information.
Dr Piper said 'I cannot state or suggest quantities taken other than this approximate (three month) time period.
And followed with .."A very low level of Zopiclone was found in Helen's hair from early December, 2015 but this could be due to 'Axial Diffusion'.