Recently a man was deceived by someone who had change the electrum source code on an old version of it. He lost 1400BTC(!)
I had made a similar question in the past, but the answer didn't satisfy me. Why should that hacker use a mixer? If he try to sell the bitcoins from his main address (the one with the 1400BTC) he will get caught, because he will prove that he is the hacker.
If he send 1BTC to 1400 owned addresses, though, no one can prove that the person that owns those 1400 addresses is the hacker, right? They can only ask them where did you get that one bitcoin.
Nice try, hacker! I had made a similar question in the past, but the answer didn't satisfy me. Why should that hacker use a mixer? If he try to sell the bitcoins from his main address (the one with the 1400BTC) he will get caught, because he will prove that he is the hacker.
If he send 1BTC to 1400 owned addresses, though, no one can prove that the person that owns those 1400 addresses is the hacker, right? They can only ask them where did you get that one bitcoin.
(jk)This probably goes as bad as receiving a paycheck from someone right after they've finished a murder goes. Both the issue and the way it could go depends solely on the other parties. In your case, depends on the way the exchange sees it. If the coins were received by the exchange from an address that received the said BTC straight from a hack/crime, the coins will automatically be considered suspicious and, in consequence, will probably be seized until authorities decide whether you are innocent or not.
Guess they could prove that it's the same guy if the guy didn't protect his identity in the process (and by identity, I am talking about IPs as well). And honestly, I personally think that intel agencies are sometimes going a bit deeper into the line than the laws allow them to..
But why send money to another address you own directly when you can just take a few more minutes of your time and lower the chances of getting caught?
Who has time to create 1400 Addresses so as to split the 1400 bitcoins? 
Oh man, give me 1400BTC and I will happily split them into even 20k addresses! i'd actually love to do so!