Is User Agent Detection still a valid method for blocking certain URL parameters from the Search Engines?

[MyaRiemer]

I'm concerned with the cloaking issue. Has anyone successfully implemented user agent detection to provide the Search engines with "clean" URLs?

[AlanMosley]

I would not risk it, wouild be better to block in robots but i donrt really like that idea much either. A no index, follow tag is better of you can manage it.

I have not seen your urls or know the reason why you have the problem, but it is best of cause to avoid the problem in the first place.