  Quantum mechanics manifests in experimental observations in several ways.
Hauge et al. (1987) and Leavens et al. (1989) had pointed out that interference
effects dominate a physical quantity called injectance. We show that, very
paradoxically, the interference related term vanish in a quantum regime making
semi-classical formula for injectance exact in this regime. This can have
useful implications to experimentalists as semi-classical formulas are much
more simple. There are other puzzling facts in this regime like an ensemble of
particles can be transmitted without any time delay or negative time delays,
whereas the reflected particles are associated with a time delay.
