It gets confusing; technically east and west are known as Plano East Senior High and Plano West Senior High ... this does not resolve the question why he was attending a HS in Plano when ostensibly he lived in Allen.
In addition to the City of Plano, the Plano Independent School District (PISD) includes parts of Dallas, Richardson, Allen, Carrollton, Garland, Lucas, Murphy, Parker, and Wylie.