Dear Editor, Methamphetamine can precipitate a brief paranoid psychosis and can trigger psychotic episodes in individuals who have a primary psychotic disorder (Curran et al., 2004). On first presentation it is not always clear what causative role methamphetamine is playing (Mathias et al., 2008). Differential diagnosis is reliant on the patient's prognosis, and it can take years before the presence of a primary psychotic disorder can be confirmed (Niemi-Pynttari et al., 2013). This can delay treatment for individuals who are on a pathway to developing a psychotic disorder.