21.   Besides, there are few mechanisms to enforce these rules across borders.

22.   Big brother also enforced strict rules.

23.   Both Democrats and Republicans were willing to enforce these rules.

24.   A central challenge, therefore, is the development of international law and supranational organizations that can make and enforce rules for the global economy.

25.   A thoroughbred owner, Goodling has sponsored legislation that would burden the Department of Agriculture with enforcing new rules for the humane transport of horses sold for slaughter.

26.   After they were driven from power by a Vietnamese invasion, the Khmer Rouge regrouped as a jungle insurgency, continuing to enforce Communist rule in areas they controlled.

27.   But enforcing those rules would have meant getting tough with state-owned, politically well-connected enterprises, so regulators and exchange officials shied away.

28.   But here, too, enforcing the rules is another matter entirely.

29.   But maybe one reason for that is the game has deteriorated because the rules are not enforced.

30.   But most police departments, which are enforcing the rules, are giving warnings for first-time infractions and then issuing summones for second violations.