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They were used to stay clean.
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Which means this unsub might be a woman.
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Who's most likely had a connection to the foster system.
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Or she simply wants a kid.
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Then why not just snatch one off the street?
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This is maternal desire. These couples took in babies.
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Maybe she lost her own or can't conceive.
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So she probably killed those people
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because when she got to their home,
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they didn't have a child in their possession.
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She'll keep killing until she finds one.
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So when was Johnny last in your house?