Determining When Latitude Location is set Manually



Does anybody know of a way to determine when somebody has set their Latitude location manually?

It seems that whenever it gets set manually, the blue or purple radius vanishes and it just shows the person at an exact location. Could there be a legitimate reason why the radius would vanish entirely from a person's Latitude location? When I mean vanish it's not even visible when zoomed in all of the way on a computer or phone (both the map on a computer and phone showed up the same way, and everybody else on my list still had a radius present).

This probably seems like an odd request, but unfortunately I suspect that my significant other may have not been truthful about their whereabouts on a few occasions, which for obvious reasons could have some significant repercussions. I plan on discussing the matter in person with my significant other, but I'd like to hear what people have to say about this before using any Latitude based information as potential evidence.

Any assistance would be much appreciated.

Thank you.