It has to be perfect with high-risk dangerous offenders. You can't take the chance that they'll step out of their zone. Then you could argue that it has to be perfect.
But if you're dealing with low-risk offenders who are not such a danger, then, even if it's imperfect, you're still creating a stronger bond with the parole officer. You're still allowing offenders to progressively argue that they need it less and less.
So would you say that even if it's not perfect, it may still be useful?