I would start browsing through cutlery shops looking for a folding knife which:<br><br>*Has a blade length of just under 3 inches, thickness of .12 inches or better, of drop point or a strong clip point design, made from high carbon stainless steel such as ATS-34, SV30 or BG42. <br><br>*Has alloy slab handles with a framelock, a spring tension cam lock like the Axis lock, or a linerlock with particularly strong liners. <br><br>*Is of quality construction with a fair guarantee or warranty<br><br>*Is user serviceable with minimal or no tools <br><br>If you can afford to buy two of them.<br><br>A number of types fit this description, but if you've got the $, think "Sebenza."<br><br>With regard to an improvised knife, I would ask a correctional officer. <br>