One is put in jail after an arrest before trial. They require a fee to be released before trial. Even if one is acquitted of charges, they do not receive refund.
No, actually not. The police can place you in arrest, but only for a limited time. Then a judge has to decide based on various factors whether you can be kept in jail until trial, whether you can get out on bail and how large the sum is, and sure, you get the bail money back if you show up in court, even if your not acquitted. [1] The important factor is that a _judge_ gets to decide that, not a prosecutor or mere policeman.
[1] Please note that if you loaned the money from a bail bondsman, the bondsman gets to keep his fees. This however is a separate transaction.
In the US, if you post BAIL you do get it back, a BOND however is a service provided by a company where by they post BAIL for you and you pay a company 10% (normally) for their service, The BOND company then guarantees to the court you will appear or they will track you down, if they bond company does not they must pay the court 100% of your BAIL. So if you have a $5,000 bail, you can go to a bonding company and get out for $500, you will not get that $500 back, however if you had the $5,000 you could give that to the courts, and get 100% of that money back.
One is put in jail after an arrest before trial. They require a fee to be released before trial. Even if one is acquitted of charges, they do not receive refund.