In a strictly legal sense, this was a sound approach.

One crime has nothing to do with the other, in a strictly legal sense.

However, in some circumstances, interests that are not strictly legal could be considered.

It wasn't strictly legal, but different rules were attached to national security matters.

You were afraid to fight us in any but the strictly legal field.

Not that every one of his dealings was strictly legal.

There were ways around that, of course, but it was all strictly legal.

Neither method is strictly legal and both are very messy.

"I think it has to do with a strictly legal problem."

"We wouldn't want to do anything not strictly legal, of course."