Hi
I agree with the last, you need to be prepared before hand. This can simple be done with the staff hand book, making employees aware that if there is any suggestions of theft etc from both parties i.e. employees and customers faking it then this will be reported to the police.
As far as the employee is concerned you need to have a meeting(s) with them rather than telling them to sit and listen, don't dismiss them straight away, be seen to be investigating if possible as the tribunals like to see this. During the meeting you need to explain the situation and accusations and agree a plan of action with them including the short term action you will take i.e. agree that you will either suspend them from duties, with pay or transfer them to another site where they can be monitored, this will cover you on the employment law bit as it is all about consultation with employees. You need to explain that this is a temporary situation until the facts have been determined. Keep your customer aware of the action you have taken, keeping them on side throughout will help to maintain the customer client relationship albeit somewhat damaged.
You then need to carry out a full investigation, which could simply be "it was there then it wasn't, and theres no one else it could be" which I can imagine is the typical responce from a customer but cctv should be checked as well as in/out logs if they are available.
Sometimes its clear cut, I had a customer ring me about £2.35 that had gone missing, I set a trap with £1.20 and that went, there was no-one else in the building so clear cut, he was dismissed there and then.
Prevention is better than cure. You need to look at your recruitment policy, we have all got the reference details but how many of us actually check up?? Employment should be subjuct to satisfactory references from previous employees and others (I ask for 3 refs)
bit of a mine field so tred carefully
You can get loads of employment info from
www.acas.org.uk they are a friendly service and well worth ringing
Hope this helps
Chris
Chris