Question: when did drug testing start in the olympics
[{'answer': '1967', 'provenance': [{'wikipedia_id': '4172697', 'title': 'Doping at the Olympic Games', 'start_paragraph_id': 4, 'start_character': 893, 'end_paragraph_id': 4, 'end_character': 897, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '4172697', 'title': 'Doping at the Olympic Games', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 897, 'bleu_score': 0.9633671568306231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6905594199943390562}, 'section': 'Section::::History.\n'}]}]