>>bright-line rule = a judicial rule of decision that is simple and straightforward and that avoids or ignore the ambiguities or difficulties of the problems at hand. The phrase dates from the mid-20th century. The metaphor of a bright line is somewhat older than the phrase bright-line rule - e.g.: "The difficult part of this case comes with regard to ... the activity of the Board of Temperance ....A bright line between that which brings conviction to one person and its influence on the body politic cannot be drawn." Girard Trust Co. v. I.R.C., 122 F.2d 108, 110 (3d Cir. 1941)./"[T]he McCambridge majority opinion ... agrees that the Kirby bright-line-rule is but a mere formalism ...." J.G.Trichter, Bright-Lining Away the Right to Counsel, Tex. Law., 6 Nov. 1989, at 26. Cf. hard and fast rule.