Much depends on the real estate rules in your State. Idaho, may not be the same for Texas. Testing may not be required on every home past a certain age in every state. In some states you disclose if you know about it, not an unknown. If a home inspector notes it as suspect on his report, you disclose it. Inspector usually requires and inspection/test/remediation then that gets done.
As stated here, asbestos siding is not a problem as its sole existence on the side of a house is not a danger to anyone, just as asbestos brake pads on a car in a driveway is not a health threat. The danger is when you wire brush old paint, the painters must make sure they have personal protective equipment, PPE, like a respirator, gloves, bunny suit, etc. Additionally, you close doors and windows during this operation, then you paint it and its done.
Old tile glued to floors with asbestos mastic is not a problem unless disturbed. This could be a deal killer as its expensive to remediate.
"Loose" asbestos usually consists of old HVAC duct seam tape. This stuff, when removed (disturbed) has to be removed with HEPA vacuum as it is peeled away and PPE. Usually done by Asbestos Remediators. Often, HVAC people will do it correctly and may be certified to do so. In my mold business associations with RE transactions, realtors tell me this is generally not a deal killer.
These are what I know about, but of course, there could be a number of old house asbestos issues to be aware of.
