What can happen to a law if it is declared unconstitutional?

When a law is declared unconstitutional, it is considered completely null and void. This means that it has no legal effect and cannot be enforced. The declaration of unconstitutionality typically comes from a ruling by a higher court that finds the law in violation of the constitution. This ruling establishes a legal precedent and ensures that the law cannot be applied or used in any context.

In contrast, while a law might be rewritten to meet constitutional standards, this is not a direct effect of being declared unconstitutional. The law must be initially invalidated before any modifications can be made. Similarly, while a law might be subject to public opinion or potentially face a public referendum in some political contexts, this is not a direct consequence of it being declared unconstitutional. Enforcing a law with modifications also does not apply because the ruling effectively removes the law's validity. Therefore, the correct understanding of the situation is that once a law is declared unconstitutional, it is fully and entirely invalidated.