warning bar code, - not the ends use the same symbol and are not a 7 or a 2 but yet another number in itself invisible. But is actually a same in opposites, at both ends reversed  Warning bar codes are usable, but under a tcc swing warning. For they are to hard for most people to determine in conscience. Swing- Which means, a programmer can slip in the center, a same and end numeral without the catholic party knowing this. If this numeral represents the numeral 6, then it is condemned where there are 3 of them in complete uniform sequence in the barcode.  This code128 barcode below, does not have 3 in complete uniform, therefore, it is safely useable.