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Illegal Discharge of Gunfire from Wikipedia
People are injured, sometimes fatally, when bullets discharged into the air fall back down. The mortality rate among those struck by falling bullets is about 32%, compared with about 2–6% normally associated with gunshot wounds.
The higher mortality is related to the higher incidence of head wounds from falling bullets.
Celebratory gunfire is the shooting of a firearm into the air in celebration. It is culturally accepted in the Balkans, the Middle East, South Asian Regions like Pakistan and Afganistan and in Latin regions like Puerto Rico as well as some areas of the United States. Common occasions for Celebratory gunfire include New Years Day as well as the religious holidays Christmas and Eid. The practice may result in random death and injury from falling bullets. Property damage is sometimes another result of celebratory gunfire; shattered windows and damaged roofs are often found after such celebrations. Describing the practice, an American Sheriff from Milwaukee County, Wisconsin, David A. Clarke Jr., said, "Even though some consider this a tradition, it is extremely dangerous and a violation of the law. In densely populated urban areas, this behavior is not only illegal, but it's reckless. There is no way of predicting where the bullet will land."
Falling-bullet injuries
People are injured, sometimes fatally, when bullets discharged into the air fall back down. The mortality rate among those struck by falling bullets is about 32%, compared with about 2–6% normally associated with gunshot wounds. The higher mortality is related to the higher incidence of head wounds from falling bullets.

A study by the U.S. Centers for Disease Control and Prevention (CDC) found that 80% of celebratory gunfire-related injuries are to the head, feet, and shoulders. In the U.S. Commonwealth of Puerto Rico, about two people die and about 25 more are injured each year from celebratory gunfire on New Year's Eve, the CDC says. Between the years 1985 - 1992, doctors at the King/Drew Medical Center in Los Angeles, California treated some 118 people for random falling-bullet injuries. 38 of them died. Kuwaitis celebrating in 1991 at the end of the Gulf War by firing weapons into the air caused 20 deaths from falling bullets.
Firearms expert Julian Hatcher studied falling bullets and found that .30 caliber rounds reach terminal velocities of 300 feet per second (90 m/s) and larger .50 caliber bullets have a terminal velocity of 500 feet per second (150 m/s). A bullet traveling at only 150 feet per second (46 m/s) to 170 feet per second (52 m/s) can penetrate human skin, and at less than 200 feet per second (60 m/s), it can penetrate the skull. A bullet that does not penetrate the skull may still result in an intracranial injury.
In 2005, the International Action Network on Small Arms (IANSA) ran education campaigns on the dangers of celebratory gunfire in Serbia and Montenegro. In Serbia, the campaign slogan was "every bullet that is fired up, must come down."
Bullets often lodge in roofs, causing minor damage that requires repair in most cases. Normally, the bullet will penetrate the roof surface through to the roof deck, leaving a

hole where water may run into the building. If the damage is not discovered and repaired, the leak can cause more costly water damage to the structure.

December 1859: An autopsy showed a native servant in India, who suddenly fell dead for no apparent reason, was mortally wounded from a bullet fired from a distance too far for the shot to be heard. The falling bullet had sufficient energy to pass through the victim's shoulder, a rib, a lung, his heart and diaphragm.
December 31, 1994: A tourist from Boston was killed by a falling bullet from celebratory firing while walking on the Moonwalk in the French Quarter of New Orleans, Louisiana. The Police Department there has been striving to educate the public of the danger since then, frequently making arrests for firing into the air.
December 31, 2004: A 75-year-old man in Orlando, Florida was mortally wounded in the heart from a falling bullet just before midnight. Police later traced a gun confiscated from a man firing into the air more than a mile away to the fatal bullet. The shooter was charged with manslaughter.
January 1, 2005: A stray bullet hit a young girl during New Year celebrations in the central square of downtown Skopje, Macedonia. She died two days later. This incident lead to the 2006 IANSA awareness campaign in that country.
December 28, 2005: A 23-year-old U.S. Army Private on leave after basic training fired a 9mm pistol into the air in celebration with friends, according to police, and one of the bullets came through a fifth floor apartment window in the New York City borough of Queens, striking a 28-year-old mother of two in the eye. Her husband found her lifeless body moments later. The shooter had been drinking the night before, and turned himself in to police the next morning when he heard the news. He was charged with second-degree manslaughter and weapons related crimes,[ and was later found guilty and sentenced to 4 to 12 years in prison.
February 25, 2007: Five people were killed by stray bullets fired at a kite festival in Lahore, Pakistan, including a 6-year-old schoolboy who was struck in the head near his home in the city's Mazang area.
July 29, 2007: At least four people were reported killed, and 17 others wounded from celebratory gunfire in the capital city of Baghdad, Iraq following the victory of the national football team in the AFC Asian Cup. Celebratory gunfire occurred despite warnings issued by Iraqi security forces and the country's leading Shiite cleric, Grand Ayatollah Ali al-Sistani, who forbade the gunfire with a religious fatwā.
In Arizona, firing a gun into the air was raised from a misdemeanor to a felony by Shannon's law, in response to the death of a 14-year-old from a stray bullet in 1999.
In California, discharging a firearm into the air is a felony punishable by three years in state prison. If the stray bullet kills someone, the shooter can be charged with murder.
In Minnesota, it is illegal to discharge a firearm over a cemetery, or at or in a public transit vehicle. Additionally, local governments may regulate the "discharge" of a weapon within their jurisdictions.
In Ohio, discharging a firearm or a deadly weapon in a public place is classified as Disorderly Conduct, a Class B Misdemeanor, punishable by up to 180 days in jail and a fine of up to $2,000.
In Texas, random gunfire is a Class A misdemeanor, punishable by a maximum one year in jail and $4,000 fine. Anyone who injures or kills someone with a stray bullet could face more serious felony charges.
In Wisconsin, criminal charges for this type of offense range from Endangering Safety by Use of a Dangerous Weapon to Reckless Homicide in the event of a death, with penalties ranging from nine months to 25 years in prison."