Question about Intense D

[potato]

It's pretty normal for body contacts between a defender and an offense especially when it's near the paint, happens almost 90% of the time when the offense is back to basket and pressing the defender backwards. The defender would often use his body (usually chest) to prevent the offense from advancing by contacting his shoulder/back .

However would the same defensive measure be allowed if it's far from the paint, say 3 point line on a ball handler or backcourt during full court pressure? The defender would stay really close to the ball handler, using his chest to have contact with the ball handler while the handler is facing sideways/backwards against the defender to protect the ball.

Also would the same technique be allowed, to pressure a ball handler out of bounds when the handler is very close to the lines?

Seems like borderline between illegal contact & pushing yet it's seems like a common D.