An undocumented 39-year-old Mexican national was arrested after he was found allegedly operating a R100 million drug laboratory in Rietfontein, Pretoria.Gauteng police spokesperson, Lieutenant Colonel Amanda van Wyk said the man was arrested on Wednesday after police followed extensive surveillance which was conducted at the premises.An undocumented 39-year-old Mexican national was arrested after he was found operating a R100 million drug laboratory in Rietfontein, Tshwane. Photo: Supplied/ SAPS“A a multi-disciplinary team comprising of the National and Provincial Organised Crime…