The problem is, drugs could have been present prior to the dogs first scenting them. AFAIK there is no way for a dog to transmit to the handler how old the scent is or what drug may have been present previously.
there is a lawsuit by Nevada Highway Patrol officers
The very officers that you claim can't be trusted and are liars. Can you make up your mind?
Obviously the NHP these three officers are suing can’t be trusted an are liars, since this has been going on since 2008...so if anything, these exceptions prove the rule, don’t they?