The legislation in proposed paragraph 254(2)(a) allows the officer to require the person to perform forthwith the physical coordination test, and “forthwith” basically means right there at the side of the road. It does not allow him to require the person to accompany him to the station. The accompanying to the station is if the person fails that test, whereupon the police officer has the reasonable and probable grounds that the person is impaired. Now, that might be impaired by alcohol, by a drug, or by a combination.
Obviously if they have the approved screening device handy and they think it's alcohol, they use that. The standard field sobriety testing will be when they have the suspicion of alcohol or drugs and they want to see whether the person can perform, in a normal way, the physical test. If they succeed with that, it's all over; he drives away. He's not required to accompany the officer unless the officer can form those reasonable and probable grounds to take him to the DRE.