Read the police reports carefully. They can be a valuable source of information. But do not believe most of what you read unless it is corroborated by the defendant, the physical evidence, or unbiased witnesses. As this officer ordered the vehicle to the curb, the occupant exhibited furtive movements, suggesting that the subject was armed and dangerous. It is never too early to formulate a theory of defense.
Some lawyers fail to formulate one until final argument.
But having no theory of defense is a ticket to failure. If we don't know where we are going, we probably won't get there. Of course, the outline of one's theory will not be written in stone. It can be changed if necessary. Nevertheless, beware of changes.