No. A bank cannot do that. A bank cannot transfer money from one account to another without prior approval or permission from the account holder from whose account money is going to be taken. If such a thing happens, the affected customer can sue the bank.
no
No. It is your account and the bank cannot move funds from one account to another without your approval or rather without you asking them for it.
Legally, in most cases, yes. Ethically, no, not without permission.
Of course. That's the purpose of a "joint" account.
Yes, you can. You don't need anyones permission before depositing cash into their account. However it would be a good courtesy to inform them to avoid surprises. Note that, banks will accept deposits into any account without much questions.
no
No. It is your account and the bank cannot move funds from one account to another without your approval or rather without you asking them for it.
I don't think they can
no
no it can't cause that is you account not somebody else
They could but it is illegal without your permission.
No one can write a check on any checking account that does not have them as a signer. If their name is not on the account it is called fraud. If their name is on the account a check can be written without permission, even if you are the main signer
Legally, in most cases, yes. Ethically, no, not without permission.
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Yes.
Yes
Every bank gets to make their own rules about such things, however, I have done that successfully with my own bank account.