ARTICLE 8 INVESTOR RESPONSIBILITY Investors and their investments shall abide by the laws, regulations, administrative guidelines and policies of the Host State for the full life cycle of those investments. ARTICLE 9 SOURCING OF REQUISITE SKILLS State Parties shall, subject to their national laws and regulations, permit investors to engage key personnel and other necessary human resources of their choice, regardless of nationality under the following circumstances: (a) where the skills do not exist in the Host State and the Region; (b) where State Parties are satisfied that the sourcing of such skills will be in compliance with regional policies; and (c) where such sourcing would enhance the development of local capacity through skills transfer. ARTICLE 10 OPTIMAL USE OF NATURAL RESOURCES State Parties shall promote the use of their natural resources in a sustainable and an environmentally friendly manner. ARTICLE 11 DOMESTIC HEALTH, SAFETY AND. ENVIRONMENTAL MEASURES State Parties recognise that it is inappropriate to encourage investment by relaxing domestic health, safety and environmental measures and agree not to waive or otherwise derogate from, international treaties they have ratified, or offer to waive or otherwise derogate from, such measures as an encouragement for the establishment, acquisition, expansion or retention in their territories, of an investment. ARTICLE 12 RIGHT OF A STATE PARTY TO REGULATE 1. In accordance with customary international law and other general principles of international law, the Host State has the right to take regulatory or other measures to ensure that development in its territory is consistent with the goals and principles of sustainable development, and with other legitimate social""and economic policy objectives. 12