Blood tests were required for marriages in the state of California in order to check whether either of the parents had a disease which could be passed on to a child. State laws requiring blood tests began to emerge in the 1930s, before penicillin and was a commonly used method to prevent disease. The most commonly checked for disease was syphilis, however HIV, Rubella and Sickle-Cell Anemia can also be detected with a blood test. There are several states which still recognize the archaic law and require a blood test prior to authorizing a marriage.  

 

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