Sentences with phrase «define trace levels»

In December, Congressman George Miller (D - CA) wrote, «The interpretive rule must be amended to establish realistic standards which take into account current testing technologies and better define trace levels of THC which are permissible for human use.»

Not exact matches

Several countries had already set up coastal tide gauges — essentially, a float attached to a pen that traced a line on a chart — and were calculating mean sea level, defined as the average of sea level measured at regular intervals between high and low tide.