Leche was acting legal clerk (
fiskal) in the
Svea Court of Appeal in 1925, co-opted member (
adjungerad ledamot) of it in 1926 and
assessor in 1929. He was a co-opted member of the Water Court of Appeals (
Vattenöverdomstolen) in 1929, an assistance at the
Ministry of Justice in 1932 and acting
judge referee in 1933. Leche was director of law cases at the Ministry of Justice from 1935 to 1939 and
hovrättsråd at the
Court of Appeal for Northern Norrland in 1936. Leche became a captain in the
Norrbotten Artillery Corps' (A 5) reserve in 1940. He was expert for law-making of the courthouse construction obligation (
tingshusbyggnadsskyldigheten) and was chairman of the committee for the reorganization of the fortification police in
Boden in 1941. Leche was chairman of the committee for the investigation of the police officer's right to use force in 1942 and member of Procedural Board (
Processnämnden) from 1946 to 1948. He was legal counsel of the
Chief of the Army from 1938 to 1939, and member of the Kopparberg County Temperance Board (
Länsnykterhetsnämnden) from 1940 to 1973. Leche was chairman of the Nya System AB's advisory board in
Kopparberg County from 1963 and chairman of the monitoring board in
Leksand from 1965 to 1969. ==Personal life==