When law means a set of rules or principles dealing with a specific area of a legal system, does it take a singular verb or plural verb:

When the law (stipulate/stipulates) so, we should disclose the information to the authority.

Many thanks in advance.

When we speak of law, it can be singular and plural, usually requiring an article.

The immigration laws of the United States

There is a law against running a red light in every city.

The laws of the land etc….
How about the example sentence, should it be "stipulates" or "stipulate" there when it means a group of or a system of laws?

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By basic grammar rules, following is true:

The laws stipulate.....

The law stipulates.....

Plural or singular depends on what was discussed in teh context.