Delaware has asked daily fantasy sports operators to stop offering real-money contests in the state after legislators failed to amend laws to explicitly authorize the activity.

On Friday, the Delaware Department of Justice announced that it had sent letters to DraftKings, FanDuel and Yahoo informing them that their real-money DFS contests “are not permitted under Delaware law” and asking the operators to add Delaware to their list of no-go states.

The DOJ says it notified state regulators in March that DFS was illegal gambling because “chance, as opposed to skill, is the dominant factor in the outcome of these contests.” Delaware law prohibits all gambling except “lotteries under State control,” and the DOJ says the state has no control over DFS activity.

The DOJ believes chance is the dominant factor in DFS contests because while a contestant may select individual athletes, he or she “has no role in how these players actually perform.” The DOJ claims that “the most skilled participants might lose and less skilled participants might win” because “real-life players are human and human behavior is unpredictable.”