Yes, it is illegal to go through someone's mail without their permission. This is considered a violation of federal law and can result in criminal charges.
If they don't have your permission, it is entirely illegal.
Yes, it most certainly is, going through some one's mail is illegal in any civilized country.
Yes, from the time the mail is sent until it is received by the person it is sent to the mail is the property of the post office and therefore government property. Preventing a person from receiving their mail is theft of government property; for which you can go to prison.
yes, very illegal. You can go to jail, or worse: die.
Yes, federal law interprets that as "intercepting" mail - it is in violation.
u cant there is a way but its illegal
YES. Tampering with someone's medications, especially if they are controlled substances by the DEA you could go to prison if convicted.
Search warrants.
No, it's illegal if they take any of them
It's not a crime to read mail that doesn't belong to you, but it is illegal to tamper with a mailbox by removing mail or placing objects into mailboxes that are not going to go through the US postal service.
Yes, are you comfortable with making payment through mail?
Yes. It is illegal for you to open anyone else's mailbox for ANY reason. You are not allowed to put anything into someone's mail box, either.