Tether was supposed to be audit-able easily using the block chain and publicly posted records by the cash holding banks. They need to get that system in place so the public can audit at any given time. This still doesn't mean they don't have the proper reserves though.. More about this on my post here: https://steemit.com/tether/@amdazed/thoughts-and-discussion-using-on-usdt-tether-crypto-currency-rumors-and-the-potential-to-crash-bitcoin-btc