Vetting process for Skype in the Classroom

Hi

I aim to make a big whole school push with Skype in the Classroom this September, but senior management need reassurance that anyobody we can connect with has been vetted sufficiently.

They are concerned about how guest speakers and organisations are vetted, as well as schools/teachers in other countries. Concerns include things such as promoting extremist views etc.

Does anyone have anything I can provide to them that would allay their fears?

Cheers