is regular, it is irrelevant whether the contractor works on a single site or across several sites. In cases where the contractor does not have opportunity for regular contact with children, 98 16-19 Academies, Special Post-16 institutions and Independent Training Providers should ensure that written notification confirms the certificate has been obtained by either the employment business or another such business. 99 16-19 Academies, Special Post-16 institutions and Independent Training Providers should obtain a copy of the certificate in such circumstances. 100 Where using a third party 16-19 Academies, Special Post-16 institutions and Independent Training Providers should ensure a DBS with barred list information is obtained for those engaging in regulated activity. 101 It will only be possible to obtain an enhanced DBS certificate for contractors in colleges which are exclusively or mainly for the provision of full-time education to children. 82 schools and colleges should decide on whether a basic DBS disclosure would be appropriate. 297. Under no circumstances should a contractor on whom no checks have been obtained be allowed to work unsupervised or engage in regulated activity relating to children. Schools and colleges are responsible for determining the appropriate level of supervision depending on the circumstances. 298. If an individual working at a school or college is self-employed, the school or college should consider obtaining the DBS check, as self-employed people are not able to make an application directly to the DBS on their own account. 299. Schools and colleges should always check the identity of contractors on arrival at the school or college. Trainee/student teachers 300. Where applicants for initial teacher training are salaried by the school or 