The alarms rang once when I went through with a kettle, I think. I had paid and had the receipt. But I was just so embarassed.....
It did occur to me, afterwards that, whilst the bell was still ringing would be a good time to walk through with whatever you want, for free!
Just a couple of quick points in passing... I've got an awful cold:
1. It is actually abuse to touch people these days. We aren't allowed to do it!
2. I thought that security guards these days had to train and take an exam to get an ID card that would be proof of their status. Or doesn't this apply to Tesco (rhetorical)?
I think you may well be right that, technically, if you touch someone "aggresively" you are technically committing an assault. The original post mentions that someone was "smacked up against a wall". Allowing for the possibility of poetic licence by the original poster "smacking someone against a wall" would certainly constitute, at least, common assault . Tesco, as the employer, would be responsible for the conduct of their employee if the incident occured as described.
With regard to certification and training many courses simply require the delegate to have attended. If you look at many of the certificates which are exhibited willy nilly you will often see the wording simply says that Person X has succesfully attended a training course. From my own experience this generally means one arrived at the training centre, was capable of writing one's name in the log, sat through a couple of lectures without falling asleep, and possibly took part in a practical exercise, and finally navigating your way back to the car park when the course closed.
An example of our obsession with certification and registration I'm afraid. And I hope you recover quickly from your cold Anne.