The common law of tort also remains particularly relevant for the type of liability an employer has where there is scientific uncertainty about the cause of an injury. In asbestos disease cases, a worker may have been employed with at a number of jobs where he was exposed to asbestos, but his injury cannot with certainty be traced to any one. Although he may be able to sue all of them, a number may have already gone insolvent. In "Fairchild v Glenhaven Funeral Services Ltd" the House of Lords held that if any employer had materially increased the risk of harm to the worker, they could would be jointly and severally liable and could be sued for the full sum, leaving it up to them to seek contribution from others and thus the risk of other businesses' insolvency. For a brief period, in "Barker v Corus" the House of Lords then decided that employers would only be liable on a proportionate basis, thus throwing the risk of employers' insolvency back onto workers. Immediately Parliament passed the Compensation Act 2006 section 3 to reverse the decision on its facts. It has also been held in "Chandler v Cape plc", in 2011, that even though a subsidiary company is the direct employer of a worker, a parent company will owe a duty of care. Thus shareholders may not be able to hide behind the corporate veil to escape their obligations for the health and safety of the workforce.