Perhaps the most careful study of the issue involved 12,000 young people.

But I needed the time to give this the most careful study.

Or but one could not be sure without careful study made by those trained to deal with such cases.

Some factor, perhaps, that we would learn only after long and careful study.

He had made a careful study of the man and his habits.

"information that is not based on facts or careful study"

He made a careful study of the mark upon the forehead.

Well have to make a careful study of the matter.

"Such an extreme claim must only be made after careful study."

With all their careful (read slow and behind the science) studies or lack of them.