If any system requires regassing that means it has leaked. No leaky system charged with a refrigerant containing Cl or FL is allowed to be 'topped up' without first repairing the leak. If you have a system with r13 in it and it has leaked, then your only option is to have the leak repaired and the system changed over to a replacement refrigerant as r13 hasn't been available for years. You may be lucky and find someone that still has some r13 stashed away.
Oh and the laws aren't new theve been around for quite some time now.
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