In recent years, US Customs and Border Protection has suspended some investigations into imports the agency suspected to be tainted by slave labour because of staff shortages, a report published by the US Government Accountability Office has found. Al Jazeera reports that under a 2016 law, it is illegal to import goods into the US that are made entirely or in part by forced labour, which includes prison work, bonded labour and child labour, but more than $400bn worth of goods likely to be made by forced labour enter the US market each year, according to estimates by the non-profit Human Trafficking Institute.