Cleaning out a well with a special tool connected to a wireline.

The lowering of the hydrostatic pressure in the wellbore due to upward movement of pipe and/or tools.

The cleaning of mains using mechanical in-pipe cleaning tools.

The taking of blood and/or urine samples from a horse for analysis by a testing laboratory. The stewards may direct any horse to be swabbed before or after it has raced, irrespective of where it finishes in the race. The samples are tested by the laboratory for any irregularities or prohibited substances or drugs. A positive swab is one which has been found to contain a prohibited substance.