But the problem is to detect them in the first place.

If something goes wrong, the problem may be hard to detect.

You do not detect any changes by the looks of the place.

Perhaps as one among many he would not be detected.

The three cases detected in 1985 turned out to be only the beginning.

How had anything moved in so close without being detected?

Then as though he had detected something in David's voice.

The question is if we can detect them in time.

Sure, you can detect one of those for the first few hours.

Yet eyes could not have detected them, and they made no sound.

However, she could detect no life coming from the figure.

Of course, the change might be too small for him to detect.

Once started they are very difficult to detect and control.

He was able to move through the land without being detected.

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

Nothing could approach now in the dark without being detected.

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

And they're difficult to detect, even when they live among us.

As to whether you can detect them, I'd have to say yes and no.

Some, like the one we see here, are so small they cannot be detected.

So far, however, they have detected little change in the numbers.

We may learn how to detect some earlier, and control others.

Under current policy, it would have been detected much earlier.

Indeed, the effect of the new law may be hard to detect.

"How did he get so close to us without being detected?"