The 9‐copy allele of 40‐pb VNTR polymorphism in DAT gene was found to be a predictor for the occurrence of not only dyskinesias but also psychosis in Caucasians (Kaiser et al., 2003), while the allele C of the rs393795 SNP in that gene was reported to extend time to dyskinesias onset in Israeli (Kaplan et al., 2014) levodopa‐treated PD patients. The gene discussed is SLC6A3; the disease is psychotic disorder.