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I know that you don't have to use a comma to introduce a quote preceded by the word 'that', but with what other words/situations does this rule apply.

e.g. The scientist said that "Cats are orange and dogs are bright purple."
Comments 
Everything can't have a rule in a language.
Hi Thecandymancan (interesting moniker Emotion: smile)

Here is a write-up about the use of quotation marks. You might find it useful.
Click here .