I forgot to add that as part of a strict separation between secret service and law enforcement, the information collected by a secret service about an individual may not be shared and it simply cannot be used as evidence in court. Its obtained under the intelligence services law, and therefore invalid in a courtroom. Thats why the police and Justice Dept cannot just take over the information collected by a secret service and use it against someone. They simply do not get the access, and anything they use is invalid. They have to conduct their very own, Court-warranted, criminal investigation, collect their own evidence etc.
The Secret Service was just the one who tipped/warned them about something or someone suspicious, like a civilian reporting to the police they think their neighbour may be planning to rob a bank.
So if the FBI or Police is tapping someone's phone, the purpose is to collect incriminating evidence and get them behind bars. Naturally, very strong legal arguments are required here, because it will affect the course of someone's life.
If the FSD, MI5, or Canadian Security Intelligence Service are tapping someone's phone, the purpose is to gain knowledge to be added to existing knowledge about a more general threat facing the country, about which reports will be made for policymakers. In specific cases where an individual becomes an acute danger, the police may be warned.
The Secret Service was just the one who tipped/warned them about something or someone suspicious, like a civilian reporting to the police they think their neighbour may be planning to rob a bank.
So if the FBI or Police is tapping someone's phone, the purpose is to collect incriminating evidence and get them behind bars. Naturally, very strong legal arguments are required here, because it will affect the course of someone's life.
If the FSD, MI5, or Canadian Security Intelligence Service are tapping someone's phone, the purpose is to gain knowledge to be added to existing knowledge about a more general threat facing the country, about which reports will be made for policymakers. In specific cases where an individual becomes an acute danger, the police may be warned.