The institutionalized patients had no detectable levels of the hormone during the day or night.

"Do not allow smoking in any house that has detectable levels of radon," he advised.

The scientist also noted that the effects of the spray did not fall below detectable levels until after 18 minutes.

These continue to turn up, at detectable and sometimes hazardous levels, in some Great Lakes sports fish.

The vibrations are not soothing because the motion is below a detectable level, but they do make people more stable.

He said 7.5 percent of private wells had detectable levels, over one-half part per billion, including several with very high amounts.

There are a few things you can do to try to increase the current flow to a detectable level.

The study found detectable levels of pesticides in 6.4 percent of public well samples.

Berger also said it found no detectable levels of mercury vapor.