In answer to the objection that urine tests reveal only very recent use of hard drugs, Bruce Reed says that before long, drug-testing technology will have advanced from urine to hair tests, which may reveal chemical traces for up to a year.
Hair tests to reveal drug use may reveal chemical traces for up to a year.
Urine tests can reveal use of drugs up to a year afterwards.
The mines were closed.
A child is riding his bike down the street.
Two people are in the picture.
A nun rides a bike.
The main arts festival is the only activity this summer.
We don't know anything about what the other person does.