Technically it would be possible to tell if an individual were het for something IF that trait was dominant. Pretty much every trait that people breed for in morphs is recessive though so practically speaking people are correct whey they say, "no, you can't tell". In most cases where there is a dominant gene though you can't tell if it's het specifically as the same phenotype would also result from homozygosity -- you would only be able to tell that it has at least one copy of that gene. I can't think of any snake examples but there are some genes where having one copy of a dominant gene (het) results in a trait being expressed and having two copies of a gene increase that trait's intensity. I forget what the word for that is called.

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