These questions are being answered by Learn HR, a market leader in the provision of HR and payroll training and nationally-recognised professional qualifications.
You have a right to be worried. Your main problem is health and safety. These young people do not have enough experience of work environments to be able to recognise safety issues that are probably obvious to adults and, of course, they have not been given health and safety instruction as part of an induction programme. There is therefore no doubt – you must ban them from the site. If you feel it right to give the older ones some experience of the world of work, do it in a structured manner during normal work hours.
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