[1] At the 1998 Commonwealth Games in Kuala Lumpur, Johnston won the bronze medal in the women's 50m prone event.

[2] She won the gold medal in the same event at the 2014 Commonwealth Games in Glasgow, winning by 0.6 of a point.

[3] She shot a games record of 620.7 to narrowly beat South Africa's Esmari van Reenen.

[2] Since 2007, Johnston has trained and competed whilst working full-time at the Ministry for Primary Industries in Wellington.

[citation needed] She has worked in the role of Manager for Food and Beverage since 2014.