Collateral Issue
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
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 raise a collateral issue.
4 Bl. Comm. 396. And see 4 Bl. Comm. 338.