"In those circumstances it was, in my respectful opinion, open to the sentencing judge to sentence the applicant upon the basis that he was 'a user dealer', without making any specific finding as regards the quantity which would have been sold or supplied by the applicant ...
In any event, this issue did not, in my opinion, have to be precisely determined as an essential aspect of the sentencing process, any more, for example, than it is necessary to determine the precise nature of an accused's involvement in an active importation of a prohibited drug ... The sentencing judge had before him only limited and imperfect information in this respect and no conclusion could have been reached by him with any confidence.
In those circumstances, it seems to me to have been open to the sentencing judge to conclude no more than he did, namely, that the applicant was a user and a dealer as opposed, for example, to someone who was exclusively a dealer, and to sentence him upon that basis."