The acts of breaking and entering a building were historically part of the definition of the crime of burglary. But most states have since broadened the definition of burglary to include any entry into a building without the permission of the owner and with the intent to commit a theft, assault, or other crime inside the building. But a few states still have a distinct criminal offense of breaking and entering a building.

And some states have a similar criminal offense of forcible and unlawful entry that make it a crime to force entry into an automobile, safe, ATM, parking meter, or vending machine.

Breaking and entering laws (and related property crime laws) are usually located in a state’s penal or criminal code (statutes).

In Missouri, burglary is defined under Missouri Revised Statutes Section 569.160. The state has broadened the traditional definition of burglary to include knowingly entering or remaining unlawfully in a building or inhabitable structure for the purpose of committing a crime therein. The statute does not require the act of 'breaking' as a necessary element, thus aligning with the modern trend of focusing on unauthorized entry with intent to commit an illegal act. Additionally, Missouri law also addresses the unlawful entry into other types of property through statutes such as Section 569.170, which covers second-degree burglary, and other provisions related to trespass and property damage. While Missouri does not have a distinct offense named 'breaking and entering,' the elements of such an offense are generally encompassed within its burglary and related property crime laws.