<unk>  generally refers to the etiquette extended between members of the same profession. The concept of<unk>  is believed to have originated within the ancient practice of medicine whereby physicians provided services to other physicians without charge. However, the philosophy does not necessarily involve the same<unk>  across all professions, nor is<unk>  a mandated privilege, but is freely given at the discretion of the party extending the<unk> . While the etiquette is not limited to physicians, the medical profession is likely the oldest and best-known one for having such a longstanding practice among its members. Some other well-known groups that have some form of<unk>  are attorneys, performing artists, and law enforcement officers. Within the law enforcement community, the term is used as a euphemism for criminal corruption and racketeering within police departments. The phrase may also describe the ethical conduct of lawyers towards each other. A well-known American joke, versions of which date to the 1870s, revolves around sharks or wolves extending (or not extending)<unk> " to lawyers.
Professional courtesy
Comstock laws
Casualty 
Admitting privileges
Patient trade-off
Individual mandate
Prescription charges
Place of safety