Choose No Trespassing Signs specifically for Oklahoma residents. Signs are printed with the state trespassing law, Okla. Stat., tit. 21, § 1835, to put trespassers on notice. Heavy-duty aluminum gurantees that signage will last for at least a decade, with resilient ink graphics by 3M. Note Oklahoma rules state that the posted signs should read messages such as "No Trespassing," "Property Restricted," or "Keep Out." On unfenced or fenced property, the signs must be conspicuously placed at all points of entry.