If you are talking about Doe urine, they go to a lot of trouble to offer fresh as possible urine. So, I'd say it's not a good idea to use stale urine. But, who knows?
i wouldnt advise it either. but if you are in the market I sell White Tail Rage scents. it is one deer to bottle or 3 deer to bottle have killed a buck every year for the past 5 years while smelling the bomb hanging or smelling it on the ground. it is bottled in grant alabama by a cousin of mine and he also sells it at my uncles produce stand on the corner poplar spring and 3 notch in ringgold near heritage high/middle. wont be available till right at mid september though. if price stays the same its $10 for a 3 oz bottle of 3 doe. can also get it at big daddys. it is in a fridge from the time it comes out and bottled to help maintain freshness.