S1: At the roadside the driver will be asked to blow through a small glass tube into a plastic bag.
S6: The driver will be asked to go to the police station.
P: And if the colour change does not reach the line the driver cannot be punished under the new law.
Q: Inside the tube are chemically treated crystals which change colour if the driver has alcohol on his breath.
R: But if the colour change does reach the line then the test has proved positive.
S: If the colour change goes beyond a certain line marked on the tube this indicates that the driver is probably over the specified limit.
The proper sequence should be:
P S Q R
S Q R P
R P S Q
Q S P R
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