Why can a general law be difficult to apply to a new or unusual case?

In the philosophy of law, a general law can be difficult to apply to new or unusual cases for several fundamental reasons:

• Legislative Limitations: Legislative bodies cannot anticipate every possible situation that may arise. When technology or social circumstances evolve—such as medical advancements that keep a legally dead person alive—the existing law may contain gaps that do not explicitly address the new scenario.1
• Inherent Ambiguity: Laws are often formulated as generalities or abstract principles. These provisions can be vague or "meaningless" until they are applied to concrete, specific situations, requiring judicial interpretation to provide clarity.1
• Indeterminacy of Legal Sources: According to American legal realists like Karl Llewellyn, authoritative sources such as statutes and precedents are often indeterminate. They may contain conflicting but equally legitimate canons of interpretation—for example, arguing that a statute should be limited to its text versus arguing it should be implemented beyond its text to fulfill its purpose.2
• Judicial Discretion: Because legal rules do not always dictate a unique outcome, judges often exercise discretion. They may interpret precedents in a "strict" or "loose" manner, allowing them to either distinguish a new case from past rulings or apply them as binding, depending on their assessment of the situation.2