If it is early in the case, courts often will grant a motion for leave to amend. Indeed, the opposing party often will agree to stipulate to allowing the amendment. Later on in the case, it may become more difficult to obtain leave to amend the pleadings. It depends. In one case, we defeated a motion for leave to amend that was filed long after the original complaint was filed, and shortly before the close of discovery. In your case, the opposing party may have decided to focus its resources on other matters in the case.
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Maybe they didn't oppose it because they didn't take it seriously.
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It can go either way. Courts usually always grant a first motion for leave to amend. Smart defendants don't usually oppose since it gives them a chance to demurrer to the complaint.
While I am an attorney, I am not your attorney. You should always speak with your own attorney to gain full and complete legal advice.
The fact that they did not oppose the Motion for Leave to Amend your complaint may be a good sign that you are dealing with reasonable attorneys on the other side because, as many lawyers here have explained, the chances of defeating a motion to amend a complaint are pretty low. It could also mean that there isn't a lot of money on the other side.
However, their non-opposition to the Motion for Leave to Amend does not mean you are out of the woods. They could file a demurrer to the First Amended Complaint to try to knock out some of the claims. Nor does it mean that if you are representing yourself here that you should continue to do so. If you intend to prove these claims, you are best served by consulting with and retaining an attorney to represent you here.
I don't intend the foregoing to be legal advice but just a general answer to a question based on Avvo's rules. In particular, you are not my client. I am not your lawyer. For further details on this issue, you should consult an attorney.
The standard on ruling on motions for leave to amend is a fairly liberal one. See Howard v. County of San Diego (2010) 184 Cal. App. 4th 1422, 1428 (the policy favoring amendment is so strong that it is a rare case in which denial of leave to amend can be justified). The idea behind the policy is to allow the parties to try their cases on the merits. It is a judicial policy that favors resolution of all disputes under various theories of recovery in the same lawsuit. Thus, opposing parties usually will not oppose such motions and will often times stipulate to an amended complaint, depending on the circumstances of the case. Once the motion is granted, the moving party will have leave to amend and will file and serve his or her amended complaint. The opposing party will then evaluate the amended pleading and may decide to demur or move to strike portions thereof.