Question: when did right to work checks come into force
[{'answer': '2006', 'provenance': [{'wikipedia_id': '52836225', 'title': 'Right to Work Law UK', 'start_paragraph_id': 19, 'start_character': 24, 'end_paragraph_id': 19, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::The Law.\n'}]}, {'provenance': [{'wikipedia_id': '52836225', 'title': 'Right to Work Law UK', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 164, 'bleu_score': 0.9383861709333501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 226577758258470670}, 'section': 'Section::::The Law.\n'}]}]