If the treatment center is local it is not a bad idea to drive over and ask to review it, inside and out. However, it is not uncommon for the best treatment center to be out of state.
Many times out of state is best because it makes it very difficult for the addict to be enabled by friends or relatives attempting to sneak them contraband. The addict can focus on treatment and not on maintaining contact with the outside world.
Out of state treatment centers should be able to supply you with pictures and video of their facility, inside and out.