When it comes to law enforcement, 'taking into custody' is a phrase that comes up often. However, there are a number of synonyms that can be used instead. The most common are probably 'arresting' and 'detaining'. These both imply a temporary holding of an individual until further action can be taken. Another option is 'apprehending', which is a more formal term that implies a greater sense of authority being asserted by the person doing the taking. 'Seizing', on the other hand, can be used in cases where something other than a person is being taken into custody, such as drugs or stolen property. Ultimately, the synonym you use will depend on the context of the situation.