Collateral Issue
Bouvier's Law Dictionary and Concise Encyclopedia · John Bouvier; revised by Francis Rawle · 1914
Bouvier's Law Dictionary and Concise Encyclopedia
An issue taken upon some matter aside from the general issue in the case. Thus, for example, a plea by the criminal that he is not the person attainted when an interval exists between attainder and execution, a plea in abatement, and other such pleas, each raises a collateral issue.
4 Bla. Com. 338, 396.