These can always be detected even at the beginning of a case.

Not once had he been detected at the business, either.

There's only two ways to detect them at any range.

But I think it's hard to detect at the beginning.

But they said it had been too small to be detected at that time.

This means that in fact, anything can be detected at present.

We may detect his private opinion only at one point.

This time, however, he'd been detected at a crucial moment.

In my view, that combination is just a touch difficult to detect at the present moment.

It could be detected at many times a radar's effective range.