Leng v. The Queen, 2007 DTC 370, 2007 TCC 59 (Informal Procedure) -- summary under Shares

The taxpayer, who was an assistant professor of pathology, engaged in approximately 17 transactions in shares of hi-tech companies in the three taxation years in question including four occasions where he bought and sold shares of a corporation within days. In finding that the taxpayer sustained losses on capital account, Rip A.C.J. stated (at 371) that "the fact that a person buys and sells shares at a short interval is not, by itself, conclusive that the person is a trader or that the venture was in the nature of trade".