It is like this, Some breeders use the DOUBLE LINES and a MARKER for picking babies from POSS HET clutches, NOTE : NOT ALL 100% Het PIEDs have these Double line MARKERs, Basically when looking through POSS HET PIEDS you would choose the ones with the DOUBLE LINE to MAYBE increase your chance of actually getting a 100% het pied from a Poss HET CLUTCH, Because we know that when you breed a 100% het pied to a NORMal about 1/2 of the Babies will actually be 100% and the other half will be Normal, the problem is THEY all look Normal so You wouldn't know which ones were really 100% hets so I personally Use the Double line theory when choosing my breeders. I have also found several of the AFRICAN Captive hatched babies have the double lines as well, So you need to watch out for SCAMS, Basically make SURE the PERSON you are dealing with is on the Up and UP. I know it is a LONG shot but I am currently raising some of the DOUBLE LINE African baby females to breed to a pied...Just to see. I personally have 100% het pieds with the MARKERS and without. Hope this helps. Thanks David
Here are a few pictures of 100% het pieds with other Morphs/Normals....

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1.0 Pied(04)(RDR)...Man that was a nice one...gone
1.0 Cinnamon Pastel(Bryan Kollwitz)(05)
2.0 Mojave Ball pythons(05)
0.1 Spider Ball(04)(RDR)
1.0 Butterscotch Ghost(04)
1.0 Albino(04)(RDR)
4.2 Pastels(03's)(04's)(ASF,Graziani,Bell lines)
2.8 Orange Granites(05)
1.0 Yellow Belly(04)(Ian G)
2.0 Yellow Belly(05)(unproven)
1.3 Yellow belly(unproven)(02,03,04's)
2.0 100% HET CLOWN(04's)(MHMR)
3.3 100% het albinos(03's)(high contrast bell line)
0.1 poss Het Albino(03's)
2.0 100% het pieds(03's)(Vin Russo,CRE)
0.2 100% het pieds(03's)(04's)(RDR,TWL)
1.2 Poss het pieds(03's)(PETE KAHL)
2.1 Poss het pieds(00's)(01's) hoping to get PIEDS this year(Vin Russo, Pete Kahl)
25 Normal adult females
60 04 females
15 normal mixed 03's
20 Assorted weird ball pythons 04's
13 baby 2005 PASTELS just HATCHED...4-8-05 and 5-10-05 (O left)