Scoreboard "1" and "0" value undifferentiated

When I'm using commands, (namely testfor and give) and am testing for someone with a score of 1, it works - kind of. Even if my score is changed back to 0, it recognizes as a 1. I have to completely reset the score for it to work.

Commands:
• testfor @a[score_<score>=1]
• testfor @a[score_<score>_min=1,score_<score>=1]
• give @a[score_<score>_min=1,score_<score>=1]