1924 -The first sub-stations were completed. They were the Florence (became Firestone Park Station in 1955) and East Los Angeles Stations.

1926 -The Hall of Justice Jail was completed. The Vermont (became Lennox Station in 1948), Norwalk, Temple City and Newhall Stations were completed.

1927 -The Altadena and San Dimas Stations were completed.

1928 -The Crime Laboratory and the County-wide teletype system were developed. Uniforms were adopted. Prior to this time, all Departmental personnel wore civilian clothes. The Fairfax Station was completed. (Became West Hollywood Station in 1957).

1931 -The Aero Squadron was created.

1932 -The marked car Patrol system was inaugurated.

1933 -The Silver Mounted Posse was formed. This year marked the beginning of the Sheriff's Reserves.

1934 -The Malibu outpost was completed.

1935 -The Sheriff's School of Instruction, now known as the Sheriff's Academy, was opened.

1937 -The Montrose and Lancaster (became Antelope Valley Station in 1961) Stations opened. Two-way radio service was instituted.

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As early as 1928 the Altadena Sheriff's Department was wire-linked to every county and state agency by teletype. With this system a national criminal advisory network was made possible. It was at least another year before Pasadena could install such a system.

In 1933 one-way radio patrol cars were provided for all stations within the county. Altadena patrols were broadcast from the Pasadena Police Department. In 1936 a proposal was made to spend $14,275 on two-way patrol cars for the county. L. A. County Sheriff Eugene Biscailuz's own experience suggested that only $4,000 should be spent on a test system.. Two portable transmitting units, one at Altadena and one at Montrose, and six cars were added to the county patrol. The test must have proven quite successful. In 1938, $1.8 million was approved for equipping Altadena and five other stations with two-way radio cars. < http://altadenasheriffs.org/history.html >

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