This case presents problems similar to those discussed in Ross v. United States, D. C. Cir., 349 F.2d 210, decided June 30, 1965. Here, however, much of the uncertainty which characterized the conviction in that case is missing. There were four closely spaced transactions in narcotic drugs. Each transaction appears to have involved a lengthy confrontation between the appellants and the undercover agent. The undercover agent was a trained officer of the Federal Narcotics Bureau, with two years experience in his work, at the time of the sales. He testified that while he used his notebook of transactions to refresh his memory as to dates and the amount of money involved, he could remember the details of the transactions independently. And only three and one-half months had passed between the last transaction and the swearing out of the arrest warrants herein.

No one of the above factors is determinative. But their total effect is such that we cannot conclude that this prosecution had dimensions as slender as Ross. 1 The parties show no other reason why we should not affirm.

Affirmed.