Introduction
A good Watchman always has a few laws up his sleeve to catch out even the most apparently law-abiding Ankh-Morpork citizen. It can instil a healthy respect of the law to occasionally haul people off to the cells for loitering, failing to carry a halberd or breathing shallowly. To make sure you are prepared, have a look through the following three sections:

Laws
Named laws and the offences they are known to cover.

Offences
Offences not falling under known laws. An example of behaviour constituting that offence is given where possible.

Ankh-Morpork Crime Codes
Taken from the 1999 Watch Diary. Numbered codes to save you time when arresting people or sending messages to other watchmen.

books currently included: gg, maa, foc, j, nw, diary

The Laws and Ordinances of the Cities of Ankh and Morpork
Competent Art Law
Technically a ‘Patrician’s Rule’. Requires all citizens or visitors intending to produce any kind of paintings for sale in Ankh-Morpork to appear before the Patrician and demonstrate to his satisfaction that they can draw a hand.
diary

Treacle and Trousers Law
Passed by Mad King Ludwig the Tree. Bans shallow breathing, requires all civic buildings to be painted purple and makes it compulsory for mirrors to be three miles long. Never repealed.
diary

War Provisions Act Part 2 of 1401
Makes it technically illegal for any male over the age of 14 to walk through the city without carrying a 9’ halberd.
diary

Fish Law of 1402
Brought in after an amusing pike/halberd/halibut mix-up regarding the above War Provisions Act. Is the shortest law on record and states: No one whatsoever is to go armed with fish in Ankh-Morpork. Last broken by Thos. Siddelly in 1714 who was convicted of recklessness in charge of a bag of clams.
diary

Ways and Means Act of 1503
Every person in Ankh-Morpork must eat a bale of hay every week.
diary

Swine and Hog Law of 1347
A literal interpretation of this law would mean that Tuesdays are illegal.
diary

General Felonies Act, 1678, Section 14 (iii)
Conspiracy to commit crime. This is what Carrot arrested the head of the Thieves' Guild for on his arrival in Ankh-Morpork.
gg

Public Ale Houses (Opening) Act of 1678
Must not a) serve or b) cause to serve alcoholic beverages after the hours of 12 (twelve) midnight.
Must not serve or cause to serve alcoholic beverages in containers other than of a size and capacity laid down by aforesaid Act.
Section Three: Must not allow customers to carry unsheathed edge weapons of a length greater than 7 (seven) inches.
Must not serve alcoholic beverages in premises apparently unlicensed for the sale and/or consumption of said beverages.
gg

Public Foregatherings (Gambling) Act 1567
gg

Licenced Premises (Hygiene) Acts of 1433, 1456, 1463, 1465 and 1470 through 1690
gg

Domestic and Domesticated Animals (Care and Protection) Act 1673
gg

Wild Animals (Public - [remainder not known]
Prohibits Releasing Feral Creatures upon the Streets.
gg

Projectile Weapons (Civic Safety) Act 1634
gg

Gambling (Regulation) Acts
gg

Decency Ordinances of 1389
Prohibits use of language like 'piss off'.
gg

Witchcraft Laws
Include bans on 'flying about'.
gg

Public Order Act of 1457, Section (vii)
Prohibits resisting arrest.
gg

Dignity of Man (Civic Rights) Act of 1341
States that prisoners have Rights.
gg

Industrial Processes Act 1508, Clause Seven
Prohibits illegally venting flame in a manner likely to cause grievous bodily harm.
gg

Being Bloody Stupid Act of 1581
You'd be breaking this by not running away when you saw Detritus knuckling along at high speed behind you.
maa

Privacy Act of 1467
Could be broken by looking in someone's bedroom chest without permission.
maa

Riot Act
Begins: "Whereby it is acknowledged..." Once it has been read to a crowd they must disperse or the Watch can use deadly force.
j

[Unknown law] of 1356
Requires that every citizen should do one hour’s archery practice every day. It has never been repealed.
j

Offences
Offence Info Source
carrying a weapon may not be current nw
carrying a weapon after dark may not be current nw
carrying a concealed weapon may not be current nw
going equipped for burglary eg carrying lock picks nw
using language likely to cause a breach of the peace eg swearing nw
breaking curfew probably not current nw
running screaming at people and trying to cut their knees off aka a No.23, normally committed by dwarfs foc
loitering eg by lying very still in a cellar somewhere foc
resisting arrest you may get self-inflicted wounds while doing this foc
burglary can only be committed within the hours of darkness. In daylight, it's housebreaking diary
making an affray eg in a bar brawl gg
riotous behaviour eg in a bar brawl gg
obstructing an officer of the watch in the execution of his duty gg
assault with a deadly weapon gg
malicious lingering an army is committing this offence gg, j
assaulting an officer of the watch in the execution of his duty gg
attempting to resist arrest gg
killing people contrary to sixteen separate Acts in Council gg
human sacrifice illegal unless using condemned criminals gg
crowing on Soul Cake Thursday was committed by a hen in 1135 gg
impeding an officer of the watch in the execution of his duty punishable by a fine of not less than thirty dollars, one month’s imprisonment or being reprimanded in custody for social inquiry reports and half an hour with a red-hot poker gg
aiding and abetting related offences are generalised abetting and persistent and reckless abetment gg
murder by means of a blunt instrument eg a dragon gg
suicide not technically an offence. Can be committed by asking for a short in a dwarf bar or walking in the night-time alleyways of the shades maa
murder uncommon, unlike suicide. Cannot be committed if there's a war on maa, j
loitering with intent can be committed by standing in the street. an army is committing this offence maa, j
obstruction can be committed by standing in the street maa
lingering while being the wrong colour/shape/species/sex can be committed by standing in the street maa
being naughtily drunk j
impersonation j
selling weapons to the enemy in times of war there's probably a law against this, according to Vimes j
behaviour likely to cause a breach of the peace an army is committing this offence j
conspiracy to cause an affray an army is committing this offence j
going equipped to commit a crime an army is committing this offence j
obstruction an army is committing this offence j
threatening behaviour an army is committing this offence j
loitering within tent an army is committing this offence j
travelling for the purposes of committing a crime an army is committing this offence j
carrying concealed weapons an army is committing this offence j

Crime Codes
Ankh-Morpork Crime Code 1:
Treachery to the City.

Ankh-Morpork Crime Code 2:
Wilful destruction of the City by Fire, Howsoever Started.

Ankh-Morpork Crime Code 3:
Malicious Lingering.

Ankh-Morpork Crime Code 7A:
Use of Magic to Change the Outward Appearance of the City’s Ruler.

Ankh-Morpork Crime Code 12:
Fifty Foot Woman has fallen off the Tower of Art. Please send traffic cones and three boxes of chalk.

Ankh-Morpork Crime Code 15:
Traffic Disturbance due to sixty foot Dragon landing on the street.

Ankh-Morpork Crime Code 19:
Murder by means of magic (except in the UU, where it’s called ‘promotion’).

Ankh-Morpork Crime Code 23:
Running Screaming at People While Drunk & Trying to Cut Their Knees Off.

Ankh-Morpork Crime Code 88:
Theft of Book from Unseen University Library.

Ankh-Morpork Crime Code 89:
Damage to Book from Unseen University Library (and also Attempted Suicide).

Ankh-Morpork Crime Code 317:
Murder with Blunt Instrument (other than Kitchen or Garden Equipment).

Ankh-Morpork Crime Code 318:
Murder with any item of Kitchen or Garden Equipment (excluding deck chairs).

Ankh-Morpork Crime Code 319:
Murder with a Sharp Instrument (other than Kitchen or Garden Equipment).

Ankh-Morpork Crime Code 412:
Persistent Street Mime with Malicious Use of White Face Paint and Black Tights.