under-the-counter

laiton, salainen illicit Illicit, obtained or sold furtively.

The village shop seemed to be a bastion of respectability but those in the know could obtain some very questionable under-the-counter material.

The frequency of under-the-counter selling is most difficult to ascertain.

Traffic and distribution of under-the-counter materials appears to be a very minor ... The total market in under-the-counter materials is estimated to be ...

of material classified as "under-the-counter" was being openly exhibited and openly sold.