Such states may prefer to use their own definitions rather than the more stringent Federal standards.

He said some states with the more stringent standard were moving to the easier one.

But with far less stringent standards than they had hoped.

Nevertheless, the Act allowed states to set more stringent standards if they wished to do so.

The department also asked for more stringent medical standards, even if that increases staff costs.

He has also argued for more stringent standards in the high schools.

The report called for standards ten times more stringent than those in effect at publication.

By any more stringent standard, however, it is full of problems.

They use more fuel and are subject to less stringent standards than cars.

I should like to see the same stringent standards applied to Washington.