Reduced employment opportunities for illegal migrants, combined with strengthened controls at the borders have resulted in a higher risk of unfounded international protection applications being used to enter the EU, which inevitably inhibits the rapid provision of protection for the third country nationals with legitimate claims. Forged documents, particularly EU passports and ID cards, are frequently used by illegal migrants to enter to the EU. Forged documents are mostly used in association with other criminal activities or types of frauds, such as the abuse of social benefits. There is growing abuse of documentation by impostors. Unconfirmed identities undermine border controls and are a potential threat to the internal security of the EU, particularly if migrants are able to conceal a criminal or terrorist past. There is an increasing risk of the use of regular, legal entry channels to enter the EU, with intent to overstay. Overstaying is probably the most common technique for illegal migration to the EU, mostly through the air borders