How do detectives find out criminals from single hair or from drop of blood? in about 200 to 400 words

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i cant give 200 words but less words
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detectives can find out criminals from a single drop of blood or hair because our blood contains DNA which can be identified by detectives through some chemical procedures and match them with other people.and our hair too contain DNA

Answers

2014-06-14T14:11:53+05:30
Because a single hair strand or drop of blood can reveal the DNA of a person...with the help of this a criminal can be identified..or used......

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mark as best plzzzzzzzzzzz.....hope i helped u :)
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