The nature of this provision is that under the current law it applies on arrest. I think I answered earlier that arrest requires that the police have reasonable and probable grounds to believe that an offence will be committed and that a particular individual is the person who will commit the offence.
This particular bill, while it requires that the police officer have reasonable grounds to believe that an offence will be committed, provides that the police officer may not know who the likely perpetrators are but knows that certain individuals are likely involved, and that if the individual is brought before a judge, that will likely prevent the commission of the terrorist activity because that person and other unknown persons who may be involved will know that the state is aware of the activities.