Yes, you can cut a 1mg clonazepam tablet in half even if it doesn't have a score line. The active ingredient is supposed to be evenly distributed throughout the tablet, so it should be safe to divide it. Just make sure to check that the specific formulation is safe to cut, as some extended-release tablets should not be split. Clonazepam comes in various strengths, so a slight variance in dose should still be within therapeutic range.