Well, the answer to these questions has just arrived.
The new Truth with ClearShotTM Laser Rangefinder from Bushnell is designed to help bowhunters ensure every shot is a clear one. ClearShot technology provides a simple, instantaneous notification that determines if you have the clearance necessary to take an unobstructed shot. Using an easy three-step process, you calibrate the rangefinder to correspond with the speed of your bow via your sight system.
Following calibration, when a target is ranged, a line appears in the reticle displaying the apex of the arrow's travel. If the dot intersects with branches or other obstacles, you know the arrow won't clear the obstruction. Conversely, an unobstructed dot indicates there's a clear path to the target, giving you confidence to take an ethical shot.
This rangefinder has all of the other bells and whistles of topnotch Bushnell models, and you can read about those features by clicking here.
To quote (sort of) Jack Nicholson from the film, A Few Good Men: You can handle the Truth.