to twenty years imprisonment with a special parole term of six years.  It is from this judgment and sentence that Barnes appeals.  We affirm.


2
In November 1976 Albert Moore was arrested by officers of the St. Louis Police Department for selling heroin.  Subsequent to this arrest Moore was approached by agents of the Drug Enforcement Administration (DEA) and officers of the St. Louis Police Department and confronted with the suggestion that he become an informant in connection with investigations into the distribution of drugs.  To further explore the idea, Moore was taken to the office of the United States Attorney where discussions concerning such a possibility transpired.


3
These discussions culminated in a cooperation agreement.  The agreement provided that in return for Moore's acting as aninformant and participating in drug transactions in that capacity any charges pending against him would be dismissed.  Moore was also to be furnished certain funds.


4
To make use of Moore's services the DEA rented adjoining apartments in St. Louis County.  One of the apartments was used by Moore as his residence.  The other apartment was used by the DEA and the St. Louis Police Department as a station from which they could monitor any activity taking place in Moore's apartment.  This monitoring was undertaken with Moore's knowledge and consent.  Consent forms were signed by Moore giving permission to have any of his telephone conversations recorded, any other conversations occurring in his apartment recorded, and any activity in his apartment video taped.  To effectuate