The US Supreme Court has repeatedly held that seizure without a warrant is per se unconstitutional, absent well established exceptions.
The proper legal course is to investigate before making an arrest. Recall the low speed pursuit of O.J Simpson who was not arrested until AFTER a warrant was issued.
Let a grand jury takes testimony under oath or affirmation, and examine evidence without filtering by politically motivated activists. If there is sufficient probable cause, the grand jury will indict. That is the appropriate time for an arrest leading to the trial by jury.