They were not actually detected until much later.

Meet a man who says that the emotional energy left behind by a traumatic event leaves a trace that can be detected years later.

It was later detected in the urine of all mammals studied.

Eris was later detected by the same survey at 97 AU.

The final group of five insurgents was detected near the flightline hours later and four were killed by gunfire from hovering helicopters.

But a conducting wire must be buried alongside the cable so it can be detected later from the surface.

Using this approach, the problem is sometimes detected later than when it develops, possibly also later than necessary.

The presence of the patch was detected later.

The cloud had to be detected sooner or later.

Traces of a sedative were later detected in his blood.