In the photo, the various pills resemble company logos -- skype, ikea etc. I wonder if that's an attempt to avoid detection when talking about them online, like "I want to go to ikea" being code for whatever the yellow one is.
tl;dr: fingerprint identification via photograph: they matched part of the hand appearing in the picture with the hand of the suspect.
>Elliott Morris of Redditch, Worcestershire, was sentenced to eight and a half years for conspiracy to supply cannabis.
Great, just great. Let's jail someone for eight fucking years because they are supplying people with Marijuana. That seams reasonable.