Here's an NFL link on the drop-kick (edit - same link as above). It's still legal, but nobody's done it in an NFL game since 1937 :
profootball
The Dropkick
Believe it or not, the dropkick remains a legal maneuver in the National Football League today. Although the dropkick has not been successfully converted on an NFL gridiron in decades, mention of it still exists in the NFL's official rule book. Rule 3, Section 8 defines the dropkick as, "a kick by a kicker who drops the ball and kicks it as, or immediately after, it touches the ground."
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Jim Thorpe
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Some of the legends who've been permanently honored in the Pro Football Hall of Fame were masters of the dropkick. Names like
Jim Thorpe,
Wilbur "Pete" Henry, and
Paddy Driscoll were known to have entertained pro football crowds with their extraordinary talent of dropkicking. Albeit, some of their exploits were exaggerated but nevertheless the dropkick was an integral part of the game in the 1920s and 1930s. It was during this era that the football slightly resembled a rugby ball. Numerous rule changes affecting the shape of the ball took place during the early years of the NFL. Changes to the ball essentially ended by 1934 as it took its familiar shape of a prolate spheroid. As a result, the number of dropkicks attempted in the NFL diminished significantly in subsequent years.
"As soon as they made the ball pointier, dropkicking went out of style. They needed the ball to bounce and to bounce true," commented Bob Carroll, a leading football historian.
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Paddy Driscoll
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In fact, it wasn't until 1963 that the league removed the category of dropkicked field goals from the record book. Driscoll shared the two major records for dropkicking when he booted fourfield goals (23, 18, 50 and 35 yards) for the Chicago Cardinals in a 19-9 win over the Columbus Tigers on October 11, 1925. That mark was equaled by the Kansas City Cowboys' Elbert Bloodgood. His four dropkicked field goals were from 35, 32, 20, and 25 yards as Kansas City edged the Duluth Eskimos, 12-7, on December 12, 1926.
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</TD></TR></TBODY></TABLE>Driscoll's 50-yarder was also an NFL best and matched the record-tying kick he made one year earlier in a game against the Milwaukee Badgers on September 28, 1924. The Cardinals defeated Milwaukee, 17-7.
Ray McLean of the Chicago Bears was the last player to successfully drop kick in the NFL. He converted an extra point following Ken Kavanaugh's 42-yard fumble recovery for a touchdown during the Bears' 37-9 win over the New York Giants in the 1941 NFL Championship Game. The drop kick came in the fourth quarter of the title game played on December 21, 1941.
Hall of Famer
Earl "Dutch" Clark is believed to be the last player to successfully dropkick a field goal in the NFL. According to game accounts, he dropkicked a 17-yard field goal in the Detroit Lions 16-7 victory over the Chicago Cardinals on September 19, 1937.
