Blueknight Ltd and Blueknight Consultancy ceased trading on 30th April 2020.

The items from our shop will remain available until stocks have been diminished and available from

Clients can order drug recognition and F.I.T. items by going to my website (above) and using the contact page page or you can also obtain these items from Amazon here ( Aide Memoir) and Pupilometer for other items i.e. Drug Recognition Cards, please contact me directly.

After fifteen years of trading, the decision to close my business has been a difficult one. During the time I have been in business, I have met many people who have not only become my clients but also close friends. To those clients and friends, I say thank you for your patronage and I wish you all well during these difficult times. Hopefully some of you may stay in touch.

Having said all that, despite the official closure of the business, I personally remain available – there are some years to go before I can official retire, again!

Good Luck

Stephen Collier. MD.