I thought as per previous discussions as to what is legal that in zone three the pertinent part of what describes a fly in the definition was (paraphrasing here) "otherwise permanently attached."
http://www.mostateparks.com/bennett/troutregs.htm
Trout Fishing Regulations
Zone 1
From the hatchery dam upstream to the end of the area. Only flies are permitted.
Zone 2
From the hatchery dam to the whistle bridge. Only flies and artificial lures are permitted.
Zone 3
From the whistle bridge to the Niangua River. Only soft plastic bait (unscented), natural and scented bait are permitted. All flies and artificial lures are prohibited, even if natural bait or scent has been added.
So once again we have to define what is not a fly or artificial lure so that we can be shure that one is not breaking the law.
http://www.sos.mo.gov/adrules/csr/current/3csr/3c10-20.pdf
(24) Flies, lures and baits: The following are
authorized for use except where restricted in
3 CSR 10-6.415, 3 CSR 10-6.535, 3 CSR 10-
11.205, 3 CSR 10-12.135 and 3 CSR 10-
12.150.
(A) Natural and scented baits—A natural
fish food such as bait fish, crayfish, frogs
permitted as bait, grubs, insects, larvae,
worms, salmon eggs, cheese, corn and other
food substances not containing any ingredient
to stupefy, injure or kill fish. Does not
include flies or artificial lures. Includes
dough bait, putty or paste-type bait, any substance
designed to attract fish by taste or
smell and any fly, lure or bait containing or
used with such substances.
(B ) Soft plastic bait (unscented)—Synthetic
eggs, synthetic worms, synthetic grubs and
soft plastic lures.
© Artificial lure—A lure constructed of
any material excluding soft plastic bait and
natural and scented bait as defined in (A) or
(B ) above.
(D ) Fly—An artificial lure constructed on
a single-point hook, using any material
except soft plastic bait and natural and scented
bait as defined in (A) or (B ) above, that is
tied, glued or otherwise permanently
attached..
*highlighed by me to show areas of relevence. even if Iam not exactcly sure what it would be ....lol
Now with out the big words I take all that to mean you could fish a "scented soft plastic scud" as long as it is not tied or permanently attached to your hook.