For NORAD and other air defense platforms, they're a ton of filtering that must be done to ignore cruft, otherwise they'd be responding to floating plastic bags

For NORAD and other air defense platforms, they're a ton of filtering that must be done to ignore cruft, otherwise they'd be responding to floating plastic bags, birds, etc, constantly. From the missile system and fighter radar perspective, that's not something they heavily (if at all) test these platforms against, because that's not a threat there's any expectation to face.