Legislative drafting error
Drafting errors sometimes occur in legislation. Usually these errors are minor, such as incorrect punctuation or capitalization, and the meaning is unaffected. But sometimes the matter is more substantive.
Commonly, the error will have something to do with cross-referencing of statutes. For instance, the U.S. statutes pertaining to probation had a drafting error which caused the section about revocation of probation for failing to submit to a drug test to incorrectly reference a section about domestic violence. By clerical error, the law also omitted an accurate reference to community confinement. However, in both cases, courts upheld Congressional intent.