21.   -- The high court refused to clear up a legal controversy about whether to stiffen rules limiting the use of expert testimony in personal injury cases and other lawsuits.

22.   A borough ordinance limits the use of its parks to residents.

23.   A new Valley city would have land use authority over the properties, limiting alternative uses of the parcels.

24.   Bush favors vouchers but their use would be limited to low-income students in schools that do not improve after three years.

25.   But Air Force officials concede that the Predator will still have trouble operating in severe icing conditions, which may limit its use over Afghanistan this winter.

26.   But Jeffrey Sachs of the Harvard Institute for International Development warns countries to limit their use to inflows of short-term investment.

27.   But no substitute has been licensed in the United States, and even the best would have limited use because the effectiveness generally lasts only a few days.

28.   But the expense of such lines usually limits their use to large businesses and government.

29.   But recent enforcement of federal guidelines strictly limiting restraint use has triggered a backlash in states that see the standards as onerous.

30.   But technical problems in implanting the devices may also be an important reason in limiting use of the larger, more sophisticated devices in smaller people such as women.