I cannot believe from what you say that the action of your employer in dismissing you and your colleagues could be considered reasonable in these circumstances. There is absolutely no evidence to connect you with the drugs and in these circumstances the situation would be properly dealt with by perhaps a written notice to you and your colleagues that drug use during working hours will not be tolerated.
It may well being that you have grounds to take your dismissal to an industrial tribunal. This will however depend upon certain other factors such as the length of your employment, the work you carry out, and any other disciplinary warnings which are relevant.
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• Get a divorce
• Have contact with my children
• Make a small claim
•Write a letter of claim
•Obtain a Grant of Probate
•Get legal advice and help with my case
•Make a Will
•Change my Name
•Prepare a legally binding agreement
• Sever a Joint tenancy
• Prepare a Partnership Agreement
• Sell a Jointly owned Property
• Appoint a Guardian for my children