hasn't happened yet. there are a lot of development projects in the que and i'm not sure where this sits on the list.
We used to have it on the old site, where you could only review a product if you had purchased it from NP. HOwever this excluded many people who had used the product, but hadn't purchased it from us and so with the new site we allow anybody to post a review, and they we go over them manually before they appear online. For a fun kick-back, legacy.nutraplanet.com