Question: when did zero tolerance policy in schools start
[{'answer': '1994', 'provenance': [{'wikipedia_id': '4552421', 'title': 'Zero tolerance (schools)', 'start_paragraph_id': 2, 'start_character': 188, 'end_paragraph_id': 2, 'end_character': 192, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4552421', 'title': 'Zero tolerance (schools)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1487, 'bleu_score': 0.9609681127174431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10820472627971663659}, 'section': 'Section::::History.\n'}]}]