Good and interesting responses.

I would first and foremost check with what your facility's protocols/procedures are with regards to the 1:1. Each facility will essentially vary a bit. At our facility, a state psych hosp, the 1:1 can depend upon the situation of the patient. If the patient listed as "assault precaution",then the rule of thumb for safety is not closer than an arm's length away if the patient opts to want to strike out. If the patient is on a "suicide precaution", the 1:1 is different. Sometimes the 1:1 can be right next to the patient or just keep the patient within constant eyesite. That is the way it is with our kids. Our psych techs are awesome and very good as to knowing what they need to do, and keeping safe, under the circumstances. At night, when a patient is sleeping, they are generally under DOS watch. The psych tech can be at the tech station and watching on the monitor. We do have some situations with 1:1/DOS that the tech must remain directly outside of the patient's room. They are never ever IN the patient's room for safety reasons. We will also have 2:1's from time to time. Techs assigned to 1:1/DOS should always be alert enough to be watching out for the safety/welfare of the patient at all times. It is up to the Charge RN on duty to make the decision/judgement as to just what all the tech can/cannot do during his/her "watch" and it will also be taken into consideration the patient involved.
So as one individual posted, it will vary from hospital to hospital, and even within a particular hospital, the 1:1 will vary depending upon the status/situation of the patient.
I hope you will be able to get clarification from the facility you work with regards to how they conduct the 1:1's.
Good luck!