Question: when did weed become legal for recreational use in washington
[{'answer': 'December 6 , 2012', 'provenance': [{'wikipedia_id': '32885226', 'title': 'Washington Initiative 502', 'start_paragraph_id': 2, 'start_character': 264, 'end_paragraph_id': 2, 'end_character': 281, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]