Cops Also Worried About Lindsay Lohan

The people closest to Lindsay Lohan aren't the only ones who are alarmed at her condition -- some police officers who routinely come in contact with Lindsay tell TMZ they have thought seriously about forcing her to get help.

Cops who see Lindsay at her worst -- late nights and early mornings when she needs assistance avoiding the paparazzi -- tell TMZ they have been concerned about her "erratic behavior" and "attitude," which have grown progressively worse over the last few months.

We're told during one of Lindsay's crazier nights out recently, cops became so concerned they discussed taking her in for a 5150 evaluation.

Cops decided against it because she didn't meet all the criteria for a 5150 -- they felt she could still take care of herself, though feebly.

As we first reported, a professional who is extremely close to Lindsay fears she's going to die if she doesn't get help for substance abuse ... stat.