Question: when did the three strikes law take effect
[{'answer': 'March 7 , 1994', 'provenance': [{'wikipedia_id': '615732', 'title': 'Three-strikes law', 'start_paragraph_id': 1, 'start_character': 116, 'end_paragraph_id': 1, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '615732', 'title': 'Three-strikes law', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 454, 'bleu_score': 0.860686010888108, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6894495890445541664}, 'section': 'Section::::Abstract.'}]}]