# AI告诉美国/英国公民他们可以通过飞往加拿大或墨西哥并重新进入美国来重置ESTA的90天限制

- **ID:** `visa/us-esta-overstay-canada-mexico`
- **领域:** visa
- **类别:** immigration_risk
- **错误码:** `US-CBP-ESTA-001`
- **验证级别:** ai_generated
- **修复率:** 95%

## 根因

美国免签计划（ESTA）规定每次访问最多停留90天；前往加拿大或墨西哥并重新进入不会重置计时器，CBP可能会拒绝入境或将停留时间减少到几天，如果怀疑旅行者试图规避限制。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| ESTA v2024 | active | — | — |
| CBP regulations 2024 | active | — | — |

## 解决方案

1. ```
   Wait at least 90 days outside the US after your last departure before re-entering on ESTA. Example: If you left the US on 2024-06-01, the earliest you can re-enter is 2024-08-30 (90 days later).
   ```
2. ```
   If you need to stay longer than 90 days, apply for a B-2 tourist visa (valid for up to 6 months) before traveling, which allows longer stays and is not subject to the 90-day limit.
   ```
3. ```
   Use the 'adjusted' stay rule: if you stay in Canada or Mexico for more than 30 days, CBP may grant a new 90-day period upon re-entry, but this is not guaranteed and depends on the officer's discretion.
   ```

## 无效尝试

- **Fly to Canada for a weekend and re-enter the US expecting a new 90-day ESTA period.** — CBP officers at the border check the entire travel history; they may consider the previous stay as part of the same visit and grant only a short admission (e.g., 7 days) or deny entry. (95% 失败率)
- **Apply for a new ESTA after re-entering from Canada, thinking it will reset the 90-day limit.** — ESTA is pre-approved for multiple entries over 2 years, but each entry is subject to CBP discretion; a new ESTA does not override the 90-day rule. (90% 失败率)
- **Use a land border crossing (e.g., from Tijuana) instead of an airport to avoid scrutiny.** — Land border crossings have the same CBP enforcement; officers often ask about previous stays and may deny entry. (85% 失败率)