User blog comment:Doctorgray/My Opinion on the Great Mod Debate/@comment-1702851-20120215201125/@comment-1156746-20120216025532

there are, in fact, 4 item types with WT. note these are possible in game but are hugely unlikely. also in this category are items artificially levelled such as favourite weapons and level 69 cyan gear.
 * 1) legitimate - items picked up in the game or those crafted to be indistinguishable from the same
 * 2) constructs - items following the gearbot rules but which have such a rare configuration as to cast dispersions upon their likelihood of occurring in game.
 * 1) modded & mods - items which need not follow gearbot rules. items with bits artfully or inartfully moved around.  double titles, destroyer barrel + pounder magazine, thus and such like.
 * 2) hax - items which break the game. scorpio and stock.  hexedited items.  over the top and far away items which players use to prevent paying the ~10% respawn fee.