The defendant carried on his person a dirk or dagger . . . [??] . . . [??] A dirk or dagger is a knife or other instrument with or without a handguard that is capable of ready use as a stabbing weapon . . . . [??]. . . [??] A pocketknife2 or non-locking folding knife is not a dirk or dagger unless the blade of the knife is exposed and locked into position.3