Revealed to adhere
A law is an instruction or way of working deliberately laid down or fixed so a spiritual law is a universal code which works for all mankind, sometimes more accessible in dreams than in reality.
Psychological / emotional perspective: When our emotions are called into question, we can find that an appropriate way of operating is offered in dreams. We work according to unwritten laws that are correct for us.
The law in the guise of a policeman is an aspect of a higher authority there to give guidance.
Material aspects: Any aspect of the law appearing in dreams is as much to do with our own code of behaviour in waking life as with ‘the law’ in the sense of authority. In dreams, our own internal sense of justice tends to take precedence over the laws of society.
Dreams of law symbolize your personal moral code and fixed beliefs that have been a part of your consciousness for as long as you can remember. This dream may be showing that it is time to reevaluate any rigid ideologies that no longer support your expanding consciousness.
As to matters of law.
To him that dreams of places of pleading, judges, attorneys, proctors, or other persons concerned in the law, it signifies trouble, anger, expense, and revealing of secrets. And if the sick man dreams be obtains his suit, he shall come to better estate; but if otherwise, he shall die. And if he which is at law dreams that he sits in the judged seat, he shall not be overthrown, but rather his adversary, A physician seen in a dream by him who is at law, signifies the same with attorneys and proctors.