I just had a long phone interview with Mark Cline, Park Ranger Supervisor at Portland Parks & Recreation (PP&R) regarding this issue. This is the gist of what he said:
For over a year, PP&R has been dealing with a group of individuals who wish to participate in a new sport called "Bicycle Polo" (BP). One of the first issues they had was finding a place to play that was both safe for the participants and durable enough to be resistant to the wear and tear caused by the sport. A compromise was reached, and two areas were generally agreed upon as being OK for BP: The ex-tennis court at Alberta Park and the hand-ball court at Colonel Summers park over on SE Taylor.
The other major issue that PP&R has had with participants of BP has been alcohol consumption. The law prohibits the use of alcohol in Portland parks without a permit, and park rangers are obliged to eject individuals from the park when they are observed in violation of this rule. In the case of large groups of people, the group as a whole is asked to leave if it is not readily apparent which individuals are consuming the alcohol.
The normal procedure in regards to this rule is to give individuals a warning the first time, and a 30 day exclusion the second time. Mr. Cline says that he is "almost positive" that no BP players have been given a 30-day exclusion despite numerous repeat offenses. He implied that he had in the past instructed rangers to avoid giving out exclusions to BP players as a matter of diplomacy. He also said that he will poll the rangers and have an exact number back to me by Saturday afternoon.
Mr. Cline went on to say that although he and another PP&R representative, Gretchen Newberry (apparently the person in charge of permits) have been in communication "off and on" with a certain individual regarding the alcohol consumption at BP events, that that person has stated that they are unable to control the actions of other players. Mark says that the alcohol situation with the BPers has gotten progressively worse, and that he finally has instructed the rangers to temporarily ban the BPers from playing until players can agree to meet with PP&R officials and agree to "internally police" the events to ensure that alcohol violations do not occur. He says that this was a calculated move to force the BPers to meet with PP&R officials to discuss and solve the issue of unpermitted alcohol consumption at Portland parks, and that until this dialogue takes place BP will not be allowed at Portland Parks, regardless of whether or not alcohol is present.