Mr. Koch said he favored changing the way businesses contract with the haulers, which are licensed by the city.
Public records show that since 1993 he has donated some $15 million to foundations and groups that favor changing the nation's drug policies.
All the candidates in the 67th say they favor changing the system, including Ms. Rosenthal, though she is not specific.
But Mr. Connor said his group favored changing the courts, not the Constitution.
He favors changing the state requirement that administrators be certified teachers, which he believes has contributed to the problems.
A week after the current uprising began, Mr. Powell said the administration did not favor changing Haiti's government.
A majority of the managers favored changing the hardware, he said, because it was considered the most direct and conservative approach.
Personally, he favors changing the union's benefit plan to charge workers if they choose to go to more expensive doctors and nurses.
A New York Times critic who attended the dinner as a guest also confirmed that the mayor had said he favored changing the law.
But he did not favor changing his group's position.